DS21Q41BT Maxim Integrated Products, DS21Q41BT Datasheet - Page 18

• Manufacturer Part Number: DS21Q41BT
• Description: IC FRAMER T1 QUAD 128-TQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21Q41BT

• Controller Type: T1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 30mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 128-TQFP, 128-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

CCR1: COMMON CONTROL REGISTER 1 (Address=37 Hex)
PAYLOAD LOOPBACK
When CCR1.1 is set to a one, the DS21Q41B will be forced into Payload LoopBack (PLB). Normally,
this loopback is only enabled when ESF framing is being performed. In a PLB situation, the DS21Q41B
will loop the 192 bits of payload data (with BPVs corrected) from the receive section back to the transmit
section. The FPS framing pattern, CRC6 calculation, and the FDL bits are not looped back; they are
reinserted by the DS21Q41B. When PLB is enabled, the following will occur:
1. Data will be transmitted from the TPOS and TNEG pins synchronous with RCLK instead of TCLK.
2. All of the receive side signals will continue to operate normally.
.
3. The TCHCLK and TCHBLK signals are forced low.
4. Data at the TSER pin is ignored.
5. The TLCLK signal will become synchronous with RCLK instead of TCLK.
(MSB)
TESE
SYMBOL
TSCLKM
RSCLKM
RSAO
RESE
TESE
ODF
PLB
FLB
ODF
POSITION
CCR1.7
CCR1.6
CCR1.5
CCR1.4
CCR1.3
CCR1.2
CCR1.1
CCR1.0
RSAO
NAME AND DESCRIPTION
Transmit Elastic Store Enable.
0=elastic store is bypassed
1=elastic store is enabled
Output Data Format.
0=bipolar data at TPOS and TNEG
1=NRZ data at TPOS; TNEG=0
Receive Signaling All ones.
0=allow robbed signaling bits to appear at RSER
1=force all robbed signaling bits at RSER to 1
TSYSCLK Mode Select.
0=if TSYSCLK is 1.544 MHz
1=if TSYSCLK is 2.048 MHz
RSYSCLK Mode Select.
0=if RSYSCLK is 1.544 MHz
1=if RSYSCLK is 2.048 MHz
Receive Elastic Store Enable.
0=elastic store is bypassed
1=elastic store is enabled
Payload Loopback.
0=loopback disabled
1=loopback enabled
Framer Loopback.
0=loopback disabled
1=loopback enabled
TSCLKM
18 of 61
RSCLKM
RESE
PLB
DS21Q41B
(LSB)
FLB