DS31256 and T1/E1 Interface

2002-11-21

摘要

This application note discusses how to connect the DS31256 HDLC Controller to the DS2155, DS21Q55, DS21Q50, and DS26528 in T1/E1, 2MHz, 4MHz, 8MHz clock mode. The hardware connection and software configuration are given.

Overview

Maxim offers a complete line of communications products. The devices provide highly integrated solutions for applications including T-carrier and E-carrier, broadband, and so on.

The DS31256 has 256 independent directional HDLC channels and supports up to 64 T1 or E1 data streams simultaneously. It supports 16 channelized or unchannelized ports and each channelized port can handle one, two or four T1 or E1 lines. There are also three fast ports on the that can each handle up to 52Mbps in both transmit and receive directions, suitable for VDSL, HSSI, or clear-channel T3 applications. All 16 ports can operate from 0 to 10Mbps when configured in unchannelized mode, and gapped clocking is supported on all ports.

The DS2155 and DS21Q55 enable the user to select - under software control - T1, E1, or J1 protocol. This simplifies the design of low-cost multiprotocol interfaces. A high-performance LIU, flexible architecture, and rich feature set make the DS2155 an excellent solution to all standard T1, E1, and J1 applications including routers, switches, muxes, ADMs, and CSU/DSUs.

The DS21Q50 contains all functions necessary for connecting to four E1 lines. It is ideally suited for E1 data pipe applications where high performance must be achieved at a low price. In addition to the four transceivers, an extra jitter attenuator resource is available to clean up transmit or backplane clocks. A clock synthesizer is available for generating backplane clocks from 2.048MHz to 16.384MHz and a single clock synthesizer can be shared between multiple DS21Q50s to facilitate smooth clock-source switching.

Connection with DS2155

Connection in T1 Mode

Hardware Configuration


Figure 1 shows the connection between DS2155 and DS31256 in T1 mode. The receive elastic store is bypassed in the framer because the transmit clock is sourced from the RCLK pin. The transmit synchronization signal is sourced from the RSYNC pin.

Figure 1. DS2155 connected to DS31256 in T1 and E1 mode.

Figure 1. DS2155 connected to DS31256 in T1 and E1 mode.


Software Configuration


Tables 1 and 2 show some of the critical register settings necessary to initialize the DS31256 and DS2155 for the operation described above. Note that they might not represent the complete register listing required for a customer application. The reader is encouraged to refer to device data sheets for further information regarding the flexibility of the DS31256 and DS2155.

Table 1. Register setting for DS31256 in T1 mode
SETTING LOCATION FUNCTION
RSSO = 0
RSS1 = 0
RUEN = 0		 RP[n]CR Set Rx port T1 mode;
Set Rx port channelized mode enable
TSSO = 0
TSS1 = 0
TUEN = 0		 TP[n]CR Set Rx port T1 mode;
Set Rx port channelized mode enable
Table 2. Register settings for DS2155 in T1 mode
SETTING LOCATION FUNCTION
T1/E1 = 0 MSTRREG.1 Select the T1 operating mod
TSIO = 0 IOCR1.1 TSYNC is an output
RSIO = 0 IOCR1.4 RSYNC is an output
TCLKINV = 0 IOCR2.6 TCLK no inversion
RCLKINV = 0 IUOCR2.7 RCLK no inversion
RB8ZS = 1 T1RCR2.5 Receive B8ZS enabled
RFM = 1 T1RCR2.6 Receive ESF framing mode
TB8ZS = 1 T1TCR2.7 Transmit B8ZS enabled
TFM = 1 T1CCR1.2 Transmit ESF framing mode
RESE = 0 ESCR.0 Receieve elastic store is bypassed
TPD = 1 LIC1.0 Normal transmitter operation
TUA = 1 LIC2.4 Transmit data normally
ETS = 0 LIC2.7 T1 mode selected

Connection in E1 Mode

Hardware Configuration


The connection between DS2155 and DS31256 in E1 mode is similar to T1 mode. The PCM31 framing mode is selected. The Receive elastic store is bypassed. The Transmit Clock is sourced from the RCLK pin. The Transmit Synchronization signal is sourced from the RSYNC pin.


Software Configuration


Tables 3 and 4 show some of the critical register settings necessary to initialize the DS31256 and DS2155 for operation as described above. Note that they might not represent the complete register listing required for a customer application. The reader is encouraged to refer to the device data sheet for further information regarding the flexibility of the DS31256 and DS2155.

Table 3. Register setting for DS31256 in E1 mode
SETTING LOCATION FUNCTION
RSSO = 0
RSS1 = 1
RUEN = 0		 RP[n]CR Set Rx port E1 mode;
Set Rx port channelized mode enable
TSSO = 0
TSS1 = 1
TUEN = 0		 TP[n]CR Set Tx port E1 mode;
Set Tx port channelized mode enable
Table 4. Register settings for DS2155 in E1 mode
SETTING LOCATION FUNCTION
T1/E1 = 1 MSTRREG.1 Select the E1 operating mode
TSIO = 0 IOCR1.1 TSYNC is an output
RSIO = 0 IOCR1.4 RSYNC is an output
TCLKINV = 0 IOCR2.6 TCLK no inversion
RCLKINV = 0 IUOCR2.7 RCLK no inversion
SYNCE = 0 E1RCR1.1 Receive auto resync enabled
RHDB3 = 1 E1RCR1.5 Receive HDB3 enabled
RSIGM = 1 E1RCR1.6 Receive CCS signaling mode
RCRC4 = 1 E1RCR1.3 Receive CRC4 enabled
TCRC4 = 1 E1TCR1.0 Transmit CRC4 enabled
THDB3 = 1 E1TCR1.2 Transmit HDB3 enabled
RESE = 0 ESCR.0 Receieve elastic store is bypassed
TPD = 1 LIC1.0 Normal transmitter operation
TUA = 1 LIC2.4 Transmit data normally
ETS = 1 LIC2.7 E1 mode selected

Connection with DS21Q55

Connection in T1 Mode

Hardware Configuration


Figure 2 shows the connection between DS21Q55 and DS31256 in T1 mode. The receive elastic store is bypassed. The transmit clock is sourced from RCLK pins. The transmit synchronization signal is source from RSYNC pins.

Figure 2. DS21Q55 connected to DS31256 in T1 mode.

Figure 2. DS21Q55 connected to DS31256 in T1 mode.

Software Configuration


Tables 5 and 6 show some of the critical register settings necessary to initialize the DS31256 and DS21Q55 for operation as described above. Note that they might not represent the complete register listing required for a customer application. The reader is encouraged to refer to the device data sheet for further information regarding the flexibility of the DS31256 and DS21Q55.

Table 5. Register setting for DS31256 in T1 mode
SETTING LOCATION FUNCTION
RSSO = 0
RSS1 = 0
RUEN = 0		 RP[n]CR Set Rx port T1 mode;
Set Rx port channelized mode enable
TSSO = 0
TSS1 = 0
TUEN = 0		 TP[n]CR Set Tx port T1 mode;
Set Tx port channelized mode enable
Table 6. Register settings for DS2155 in T1 mode
The following settings apply to all four ports (transceivers):
SETTING LOCATION FUNCTION
T1/E1 = 0 MSTRREG.1 Select the T1 operating mode
TSIO = 0 TP[n]CR Set Tx port T1 mode;
Set Tx port channelized mode enable
RSIO = 0 IOCR1.4 RSYNC is an output
TCLKINV = 0 IOCR2.6 TCLK no inversion
RCLKINV = 0 IUOCR2.7 RCLK no inversion
RB8ZS = 1 T1RCR2.5 Receive B8ZS enabled
RFM = 1 T1RCR2.6 Receive ESF framing mode
TB8ZS = 1 T1TCR2.7 Transmit B8ZS enabled
TFM = 1 T1CCR1.2 Transmit ESF framing mode
RESE = 0 ESCR.0 Receieve elastic store is bypassed
TPD = 1 LIC1.0 Normal transmitter operation
TUA = 1 LIC2.4 Transmit data normally
ETS = 0 LIC2.7 T1 mode selected

Connection in 8M Mode

Hardware Configuration


Figure 3 shows the connection between DS21Q55 and DS31256 in 8M mode. The four E1 data bus on the backplane bus is in frame interleave mode. The receive elastic store is enabled. The transmit clock is source from RCLK pin. The 8kHz transmit synchronization signal is generated from the RSYNC pin of the first device on the bus. All other devices on the bus have their frame syncs configured as inputs.

Figure 3. DS21Q50 connected to DS31256 in 8M mode.

Figure 3. DS21Q50 connected to DS31256 in 8M mode.

Software Configuration


Tables 7 and 8 show some of the critical register settings necessary to initialize the DS31256 and DS2155 for operation as described above. Note that they might not represent the complete register listing required for a customer application. The reader is encouraged to refer to the device data sheet for further information regarding the flexibility of the DS31256 and DS2155.

Table 7. Register setting for DS31256 in 8M mode
SETTING LOCATION FUNCTION
RSSO = 1
RSS1 = 1
RUEN = 0		 RP[n]CR Set Rx port 8.192MHz mode;
Set Rx port channelized mode enable
TSSO = 1
TSS1 = 1
TUEN = 0		 TP[n]CR Set Tx port 8.192MHz mode;
Set Tx port channelized mode enable
Table 8. Register settings for DS2155 in 8M mode
The following settings apply to all four ports (transceivers)
SETTING LOCATION FUNCTION
T1/E1 = 1 MSTRREG.1 Select the E1 operating mode
TCLKINV = 0 IOCR2.6 TCLK no inversion
RCLKINV = 0 IUOCR2.7 RCLK no inversion
SYNCE = 0 E1RCR1.1 Receive auto resync enabled
RHDB3 = 1 E1RCR1.5 Receive HDB3 enabled
RSIGM = 1 E1RCR1.6 Receive CCS signaling mode
RCRC4 = 1 E1RCR1.3 Receive CRC4 enabled
TCRC4 = 1 E1TCR1.0 Transmit CRC4 enabled
THDB3 = 1 E1TCR1.2 Transmit HDB3 enabled
RESE = 0 ESCR.0 Receieve elastic store is bypassed
TPD = 1 LIC1.0 Normal transmitter operation
TUA = 1 LIC2.4 Transmit data normally
ETS = 1 LIC2.7 E1 mode selected
RSCLKM = 1 IOCR2_S1.0 IBO enabled
TSCLKM = 1 IOCR2_S1.1 IBO enabled

The following settings apply to the specified port (transceiver):

BPEN = 1    TC#1, CCR2.0    Enable BPCLK1 pin
BPCS0 = 1   TC#1, CCR2.1    Backplane clock select
BPCS1 = 0   TC#1, CCR2.2    8.192MHz


TSIO = 0    TC#1, IOCR1.1   TSYNC is an input
RSIO = 0    TC#1, IOCR1.4   RSYNC is an output


TSIO = 0    TC#2, IOCR1.1   TSYNC2 is an input
RSIO = 1    TC#2, IOCR1.4   RSYNC2 is an input


TSIO = 0    TC#3, IOCR1.1   TSYNC3 is an input
RSIO = 1    TC#3, IOCR1.4   RSYNC3 is an input


TSIO = 0    TC#4, IOCR1.1   TSYNC4 is an input
RSIO = 1    TC#4, IOCR1.4   RSYNC4 is an input


                            This is Transceiver #1 on the
DA0 = 0     TC#1, IBOC.0    bus.
DA1 = 0     TC#1, IBOC.1
DA2 = 0     TC#1, IBOC.2
IBOEN = 1   TC#1, IBOC.3
IBOSEL = 1  TC#1, IBOC.4    Interleave Bus Operation
IBS0 = 1    TC#1, IBOC.5    enabled
IBS1 = 0    TC#1, IBOC.6    Frame Interleave Operation
                            Four transceivers on the bus


                            This is Transceiver #2 on the
DA0 = 1     TC#1, IBOC.0    bus.
DA1 = 0     TC#1, IBOC.1
DA2 = 0     TC#1, IBOC.2
IBOEN = 1   TC#1, IBOC.3
IBOSEL = 1  TC#1, IBOC.4    Interleave Bus Operation
IBS0 = 1    TC#1, IBOC.5    enabled
IBS1 = 0    TC#1, IBOC.6    Frame Interleave Operation
                            Four transceivers on the bus


                            This is Transceiver #3 on the
DA0 = 0     TC#1, IBOC.0    bus.
DA1 = 1     TC#1, IBOC.1    
DA2 = 0     TC#1, IBOC.2
IBOEN = 1   TC#1, IBOC.3
IBOSEL = 1  TC#1, IBOC.4    Interleave Bus Operation
IBS0 = 1    TC#1, IBOC.5    enabled
IBS1 = 0    TC#1, IBOC.6    Frame Interleave Operation
                            Four transceivers on the bus


                            This is Transceiver #4 on the
DA0 = 1     TC#1, IBOC.0    bus.
DA1 = 1     TC#1, IBOC.1
DA2 = 0     TC#1, IBOC.2
IBOEN = 1   TC#1, IBOC.3
IBOSEL = 1  TC#1, IBOC.4    Interleave Bus Operation
IBS0 = 1    TC#1, IBOC.5    enabled
IBS1 = 0    TC#1, IBOC.6    Frame Interleave Operation
                            Four transceivers on the bus

Where:

TC#1 = Transceiver #1 (TS1, TS0 = 00)

TC#2 = Transceiver #2 (TS1, TS0 = 01)

TC#3 = Transceiver #3 (TS1, TS0 = 10)

TC#4 = Transceiver #4 (TS1, TS0 = 11)

Connection with DS21Q50

Connection in 2M Mode

Hardware Configuration


Figure 4 shows the connection between the DS21Q50 and DS31256 in 2M mode. As the IBO function is disabled, the transmit clock of each port is source from TCLK pin, which is connected to SYSTLK1. The Layer 1 of DS31256 is configured as E1 port.

Figure 4. DS21Q50 connected to DS31256 in 2M mode.

Figure 4. DS21Q50 connected to DS31256 in 2M mode.

Software Configuration


Tables 9 and 10 show some of the critical register settings necessary to initialize the DS31256 and DS21Q50 for operation as described above. Note that they might not represent the complete register listing required for a customer application. The reader is encouraged to refer to the device data sheet for further information regarding the flexibility of the DS31256 and DS21Q50.

Table 9. Register setting for DS31256
SETTING LOCATION FUNCTION
RSSO = 0
RSS1 = 1
RUEN = 0		 RP[n]CR Set Rx port E1 mode;
Set Rx port channelized mode enable
TSSO = 0
TSS1 = 1
TUEN = 0		 TP[n]CR Set Tx port E1 mode;
Set Tx port channelized mode enable
Table 10. Register settings for DS21Q50
The following settings apply to all four ports (transceivers):
SETTING LOCATION FUNCTION
IBOEN = 0 IBO.3 Disable IBO operation
RSIO = 0 RCR.5 RSYNC pin is an output
RSM = 0 RCR.6 RSYNC is in frame mode
TSIO = 0 TCR.0 TSYNC in an input
TSM = 0 TCR.1 TSYNC is in frame mode

Connection in 8M Mode

Hardware Configuration


Figure 5 shows the connection between the DS21Q50 and DS31256 in 8M mode. In order to ensure data integrity in IBO mode, all clock and sync signals should be phase-aligned. The receive-elastic store for each of the four transceivers must be enabled. They should all receive the same frame-reference pulse (RSYNC) and 8.192MHz system clock (SYSCLK). In this case, the phase-locked frame pulse is provided by the system backplane; and the 21Q50's system-clock synthesizer provides the 8.192MHz clock. Note that the 8.192MHz clock can be created internally from any of the four E1 line recovered clocks. In IBO mode, the DS21Q50 can create transmit clock (TCLK) for each E1 formatter by dividing down the applied SYSCLK. The Layer 1 of DS31256 is configured as channelized 8MHz port.

Figure 5. DS21Q50 connected to DS31256 in 8M mode.

Figure 5. DS21Q50 connected to DS31256 in 8M mode.

Software Configuration


Tables 11 and 12 show some of the critical register settings necessary to initialize the DS31256 and DS21Q50 for operation as described above. Note that they might not represent the complete register listing required for a customer application. The reader is encouraged to refer to the device data sheet for further information regarding the flexibility of the DS31256 and DS21Q50.

Table 11. Register settings for DS31256
The following settings apply to all four ports (transceivers):
SETTING LOCATION FUNCTION
RSSO = 1
RSS1 = 1
RUEN = 0		 RP[n]CR Set Rx port 8.192MHz mode;
Set Rx port channelized mode enable
TSSO = `
TSS1 = 1
TUEN = 0		 TP[n]CR Set Tx port 8.192MHz mode;
Set Tx port channelized mode enable
RSM = 0 RCR.6 RSYNC is in frame mode
TSIO = 0 TCR.0 TSYNC in an input
TSM = 0 TCR.1 TSYNC is in frame mode
Table 12. Register settings for DS21Q50
The following settings apply to all four ports (transceivers):
SETTING LOCATION FUNCTION
IBOEN = 1 IBO.2 Enable IBO operation
IBOTCS = 1 IBO.6 Transmit clock derived from SYSCLK
SCS0 = 0 IBO.4 8.192MHz operation (4 ports on the PCM bus)
SCS1 = 1 IBO.5
RESE = 1 RCR.4 Enable receive elastic store
RSIO = 1 RCR.5 RSYNC pin is an input
RSM = 0 RCR.6 RSYNC is in frame mode
TSIO = 1 TCR.0 TSYNC in an output
TSM = 0 TCR.1 TSYNC is in frame mode

The following settings apply to the specified port (transceiver):

SCS0 = 1    TC#1, SCICR.0   Select the recovered clock from
SCS1 = 0    TC#1, SCICR.1   transceiver #1 as the source for
SCS2 = 0    TC#1, SCICR.2   the system clock synthesizer


CSS0 = 0    TC#1, SCICR.3   8.192MHz operation (4 ports on
CSS1 = 1    TC#1, SCICR.4   the PCM bus)


SOE = 1     TC#1, SCICR.5    Enable synthesizer clock output


DA0 = 0     TC#1, IBO.0     Set transceiver #1 as the first
DA1 = 0     TC#1, IBO.1     device on the PCM bus
DA2 = 0     TC#1, IBO.2     


DA0 = 1     TC#2, IBO.0     Set transceiver #2 as the second
DA1 = 0     TC#2, IBO.1     device on the PCM bus
DA2 = 0     TC#2, IBO.2


DA0 = 0     TC#3, IBO.0     Set transceiver #1 as the third
DA1 = 1     TC#3, IBO.1     device on the PCM bus
DA2 = 0     TC#3, IBO.2


DA0 = 1     TC#4, IBO.0     Set transceiver #4 as the fourth
DA1 = 1     TC#4, IBO.1     device on the PCM bus
DA2 = 0     TC#4, IBO.2


TSM = 0     TCR.1           TSYNC is in frame mode

Where:

TC#1 = Transceiver #1 (TS1, TS0 = 00)

TC#2 = Transceiver #2 (TS1, TS0 = 01)

TC#3 = Transceiver #3 (TS1, TS0 = 10)

TC#4 = Transceiver #4 (TS1, TS0 = 11)

Connection with DS26528

Connection in 8M Mode

Hardware Configuration


Figure 6 shows the connection between DS26528 and DS31256 in 8M mode. Two four E1 data bus (A and B) on the backplane bus is in frame interleave mode. The receive elastic store is enabled. The transmit clock is source from RCLK pin. The 8kHz transmit synchronization signal is generated from the RSYNC pin of the first device on the bus. All other devices on the bus have their frame syncs configured as inputs.

Figure 6. DS26528 connected to DS31256 in 8M mode.

Figure 6. DS26528 connected to DS31256 in 8M mode.

Software Configuration


Tables 13 and 14 show some of the critical register settings necessary to initialize the DS31256 and DS26528 for operation as described above. Note that they might not represent the complete register listing required for a customer application. The reader is encouraged to refer to the device data sheet for further information regarding the flexibility of the DS31256 and DS26528.

Table 13. Register Settings for DS31256 in 8M Mode
SETTING LOCATION FUNCTION
RSS0 = 1
RSS1 = 1
RUEN = 0		 RP[n]CR Set Rx port 8.192MHz mode;
set Rx port channelized mode enable
TSS0 = 1
TSS1 = 1
TUEN = 0		 TP[n]CR Set Tx port 8.192MHz mode;
set Tx port channelized mode enable
Table 14. Register Settings for DS26528 in 8M Mode
The following settings apply to all 8 ports (transceivers):
SETTING LOCATION FUNCTION
T1/E1 = 1 TMMR.0 & RMMR.0 Select the E1 operating mode
FRM_EN = 1 TMMR.7 & RMMR.7 Framer enabled
TCLKINV = 0 TIOCR.7 TCLK no inversion
RCLKINV = 0 RIOCR.7 RCLK no inversion
SYNCE = 0 RCR1.2 Receive auto resync enabled
RCRC4 = 1 RCR1.3 Receive CRC4 enabled
RSIGM = 1 RCR1.5 Receive CCS signaling mode
RHDB3 = 1 RCR1.6 Receive HDB3 enabled
TCRC4 = 1 TCR1.0 Transmit CRC4 enabled
THDB3 = 1 TCR1.2 Transmit HDB3 enabled
RESE = 0 RESCR.0 Receive elastic store is bypassed
T1J1E1S = 0 LTRCR.1 Configures the LIU for E1 operation
TE = 1 LMCR.0 TTIP/TRING outputs enabled
RSCLKM = 1 RIOCR.4 IBO enabled
TSCLKM = 1 TIOCR.4 IBO enabled
INIT_DONE = 1 TMMR.6 & RMMR.6 Set the INIT_DONE for each framer

The following settings apply to the specified port (transceiver):

BPCLK0 = 0  GFCR.4          Enable BPCLK1 pin
BPCLK1 = 1  GFCR.5
IBOMS0 = 0  GFCR.6          Backplane clock select
IBOMS1 = 1  GFCR.7          8.192MHz


TSIO = 0    TC#1, TIOCR.2   TSYNC1 is an input
RSIO = 0    TC#1, RIOCR.2   RSYNC1 is an output


TSIO = 0    TC#2,TIOCR.2    TSYNC2 is an input
RSIO = 1    TC#2, RIOCR.2   RSYNC2 is an input


TSIO = 0    TC#3,TIOCR.2    TSYNC3 is an input
RSIO = 1    TC#3, RIOCR.2   RSYNC3 is an input


TSIO = 0    TC#4,TIOCR.2    TSYNC4 is an input
RSIO = 1    TC#4, RIOCR.2   RSYNC4 is an input


TSIO = 0    TC#5,TIOCR.2    TSYNC5 is an input
RSIO = 0    TC#5, RIOCR.2   RSYNC5 is an output


TSIO = 0    TC#6,TIOCR.2    TSYNC6 is an input
RSIO = 1    TC#6, RIOCR.2   RSYNC6 is an input


TSIO = 0    TC#7,TIOCR.2    TSYNC7 is an input
RSIO = 1    TC#7, RIOCR.2   RSYNC7 is an input


TSIO = 0    TC#8, TIOCR.2   TSYNC8 is an input
RSIO = 1    TC#8, RIOCR.2   RSYNC8 is an input


DA0 = 0     TC#1, RIBOC.0   This is Transceiver #1 on the
DA1 = 0     TC#1, RIBOC.1   bus.
DA2 = 0     TC#1, RIBOC.2
IBOEN = 1   TC#1, RIBOC.3   Interleave Bus Operation
IBOSEL = 1  TC#1, RIBOC.4   enabled
IBS0 = 1    TC#1, RIBOC.5   Frame Interleave Operation
IBS1 = 0    TC#1, RIBOC.6   Four transceivers on the bus


DA0 = 1     TC#2, RIBOC.0   This is Transceiver #2 on the
DA1 = 0     TC#2, RIBOC.1   bus.
DA2 = 0     TC#2, RIBOC.2
IBOEN = 1   TC#2, RIBOC.3   TC#2, RIBOC.3
IBOSEL = 1  TC#2, RIBOC.4   enabled
IBS0 = 1    TC#2, RIBOC.5   Frame Interleave Operation
IBS1 = 0    TC#2, RIBOC.6   Four transceivers on the bus


DA0 = 0     TC#3, RIBOC.0   This is Transceiver #3 on the
DA1 = 1     TC#3, RIBOC.1   bus.
DA2 = 0     TC#3, RIBOC.2   
IBOEN = 1   TC#3, RIBOC.3   Interleave Bus Operation
IBOSEL = 1  TC#3, RIBOC.4   enabled 
IBS0 = 1    TC#3, RIBOC.5   Frame Interleave Operation
IBS1 = 0    TC#3, RIBOC.6   Four transceivers on the bus


DA0 = 1     TC#4, RIBOC.0   This is Transceiver #4 on the
DA1 = 1     TC#4, RIBOC.1
DA2 = 0     TC#4, RIBOC.2
IBOEN = 1   TC#4, RIBOC.3   Interleave Bus Operation
IBOSEL = 1  TC#4, RIBOC.4   enabled
IBS0 = 1    TC#4, RIBOC.5   Frame Interleave Operation
IBS1 = 0    TC#4, RIBOC.6   Four transceivers on the bus


DA0 = 0     TC#5, RIBOC.0   This is Transceiver #5 on the
DA1 = 0     TC#5, RIBOC.1   bus.
DA2 = 0     TC#5, RIBOC.2
IBOEN = 1   TC#5, RIBOC.3   Interleave Bus Operation
IBOSEL = 1  TC#5, RIBOC.4   enabled
IBS0 = 1    TC#5, RIBOC.5   Frame Interleave Operation
IBS1 = 0    TC#5, RIBOC.6   Four transceivers on the bus


DA0 = 1     TC#6, RIBOC.0   This is Transceiver #6 on the
DA1 = 0     TC#6, RIBOC.1   bus.
DA2 = 0     TC#6, RIBOC.2   Interleave Bus Operation
IBOEN = 1   TC#6, RIBOC.3   enabled
IBS0 = 1    TC#6, RIBOC.5   Frame Interleave Operation
IBS1 = 0    TC#6, RIBOC.6   Four transceivers on the bus


DA0 = 0     TC#7, RIBOC.0   This is Transceiver #7 on the
DA1 = 1     TC#7, RIBOC.1   bus.
DA2 = 0     TC#7, RIBOC.2   
IBOEN = 1   TC#7, RIBOC.3   Interleave Bus Operation
IBOSEL = 1  TC#7, RIBOC.4   enabled
IBS0 = 1    TC#7, RIBOC.5   Frame Interleave Operation
IBS1 = 0    TC#7, RIBOC.6   Four transceivers on the bus


DA0 = 1     TC#8, RIBOC.0   This is Transceiver #8 on the
DA1 = 1     TC#8, RIBOC.1
DA2 = 0     TC#8, RIBOC.2
BOEN = 1    TC#8, RIBOC.3   Interleave Bus Operation
IBOSEL = 1  TC#8, RIBOC.4   enabled
IBS0 = 1    TC#8, RIBOC.5   Frame Interleave Operation
IBS1 = 0    TC#8, RIBOC.6   Four transceivers on the bus

Note: The address of TC#1 to TC#8 is 1001H + (20h x n): where n = 0 to 7, for ports 1 to 8

Conclusion

This application note describes how to connect the DS31256 HDLC controller to the DS2155, DS21Q55, DS26528, and DS21Q50 in T1/E1, 2MHz, 4MHz, and 8MHz mode. The hardware and software configuration are given. Users are encouraged to contact the factory for support of their particular application.

If you have further questions about our HDLC controller products, please contact the Telecommunication Applications support team



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