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DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver
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Register Name:
TR.H1FC, TR.H2FC
Register Description:
HDLC # 1 FIFO Control
HDLC # 2 FIFO Control
Register Address:
91h, A1h
Bit # 7 6 5 4 3 2 1 0
Name — — TFLWM2 TFLWM1 TFLWM0 RFHWM2 RFHWM1 RFHWM0
Default 0 0 0 0 0 0 0 0
Bits 3 – 5: Transmit FIFO Low-Watermark Select (TFLWM0 to TFLWM2)
TFLWM2 TFLWM1 TFLWM0
Transmit FIFO Watermark
(bytes)
0 0 0 4
0 0 1 16
0 1 0 32
0 1 1 48
1 0 0 64
1 0 1 80
1 1 0 96
1 1 1 112
Bits 0 – 2: Receive FIFO High-Watermark Select (RFHWM0 to RFHWM2)
RFHWM2 RFHWM1 RFHWM0
Receive FIFO Watermark
(bytes)
0 0 0 4
0 0 1 16
0 1 0 32
0 1 1 48
1 0 0 64
1 0 1 80
1 1 0 96
1 1 1 112