ds3171n Maxim Integrated Products, Inc., ds3171n Datasheet - Page 161

• Manufacturer Part Number: ds3171n
• Description: Ds3171, Ds3172, Ds3173, Ds3174 Single/dual/triple/quad Ds3/e3 Single-chip Transceivers
• Manufacturer: Maxim Integrated Products, Inc.

12.6.2 HDLC Receive Side Register Map
The receive side utilizes five registers.
Table 12-18. Receive Side HDLC Register Map
12.6.2.1 Register Bit Descriptions
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit #
Name
Default
Bits 13 to 8: Receive HDLC Data Available Level (RDAL[4:0]) – These five bits indicate the minimum number of
eight byte groups that must be stored (contain data) in the Receive FIFO before HDLC data is considered to be
available (RHDA=1). For example, a value of 21 (15h) results in HDLC data being available when the Receive
FIFO contains 168 (A8h) bytes or more.
Bit 3: Receive Bit Reordering Enable (RBRE) – When 0, bit reordering is disabled (The first bit received is in the
LSB of the Receive FIFO Data byte RFD[0]). When 1, bit reordering is enabled (The first bit received is in the MSB
of the Receive FIFO Data byte RFD[7]).
Bit 2: Receive Data Inversion Enable (RDIE) – When 0, the incoming data is directly passed on for packet
processing. When 1, the incoming data is inverted before being passed on for packet processing.
Bit 1: Receive FCS Processing Disable (RFPD) – When 0, FCS processing is performed (the packets have an
FCS appended). When 1, FCS processing is disabled (the packets do not have an FCS appended).
Bit 0: Receive FIFO Reset (RFRST) – When 0, the Receive FIFO will resume normal operations, however, data is
discarded until a start of packet is received after RAM power-up is completed. When 1, the Receive FIFO is
emptied, any transfer in progress is halted, the FIFO RAM is powered down, the RHDA bit is forced low, and all
incoming data is discarded.
(0,2,4,6)BAh
(0,2,4,6)BCh HDLC.RFDR
(0,2,4,6)BEh
(0,2,4,6)B0h HDLC.RCR
(0,2,4,6)B2h
(0,2,4,6)B4h HDLC.RSR
(0,2,4,6)B6h HDLC.RSRL
(0,2,4,6)B8h HDLC.RSRIE
Address
15
--
--
0
7
0
Register
14
--
--
--
--
--
0
6
0
HDLC.RCR
HDLC Receive Control Register
(0,2,4,6)B0h
HDLC Receive Control Register
Unused
HDLC Receive Status Register
HDLC Receive Status Register Latched
HDLC Receive Status Register Interrupt Enable
Unused
HDLC Receive FIFO Data Register
Unused
Register Description
13
--
--
0
5
0
RDAL4
12
--
0
0
4
161
RDAL3
RBRE
11
1
3
0
RDAL2
RDIE
10
0
2
0
RDAL1
RFPD
9
0
1
0
RFRST
RDAL0
8
0
0
0