Preliminary Data Sheet
May 2001
TMXF28155/51 Super Mapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
253
Agere Systems Inc.
12 28-Channel Framer Registers
(continued)
12.4 HDLC Global Configuration and Status Registers
Table 327. FRM_HGR1, Transmit HDLC Global Register 1 (R/W)
Table 328. FRM_HGR2, Transmit HDLC Global Register 2 (R/W)
Table 329. FRM_HGR3, Transmit HDLC Global Register 3 (R/W)
Table 330. FRM_HGR4, Transmit HDLC Global Register 4 (R/W)
Address
Bit
Name
Function
Reset
Default
0x00
0x000
0x80140
15:10
9:0
—
Reserved.
Must write to 0.
FRM_HTTHRSH0[9:0]
HDLC Transmit FIFO Threshold 0.
These bits indicate
the threshold levels for the Tx FIFOs. When a channel is
enabled and the number of bytes in its FIFO decrements
to this value, its FRM_HTTHRSH (
Table 436
) bit is set
(optionally causes interrupt). FRM_HTTHRSH0[9:0] or
FRM_HTTHRSH1[9:0] is selected on a per-channel basis
with the FRM_HTTHRSEL (
Table 436
) parameter.
Address
Bit
Name
Function
Reset
Default
0x00
0x000
0x80141
15:10
9:0
—
Reserved.
Must write to 0.
FRM_HTTHRSH1[9:0]
HDLC Transmit FIFO Threshold 1.
These bits indicate
the threshold levels for the Tx FIFOs. When a channel is
enabled and the number of bytes in its FIFO decrements
to this value, its FRM_HTTHRSH bit is set (optionally
causes interrupt). FRM_HTTHRSH0[9:0] or
FRM_HTTHRSH1[9:0] is selected on a per-channel basis
with the FRM_HTTHRSEL (
Table 436
) parameter.
Address
Bit
Name
Function
Reset
Default
0x00
0x00
0x80142
15:8
7:0
—
Reserved.
Must write to 0.
FRM_TXICHAR0[7:0]
Transparent Mode Transmit Idle Char 0.
These bits are
used in transparent mode. They represent the first 8-bit pat-
tern the transmitter should send when there is no data
available in the FIFO. One of the four patterns can be
selected on a per-channel basis with the
FRM_HXPIDLE[1:0] (
Table 436
) parameter.
Address
Bit
Name
Function
Reset
Default
0x00
0x00
0x80143
15:8
7:0
—
Reserved.
Must write to 0.
FRM_TXICHAR1[7:0]
Transparent Mode Transmit Idle Char 1.
These bits are
used in transparent mode. They represent the second 8-bit
pattern the transmitter will send when there is no data avail-
able in the FIFO. One of the four patterns can be selected
on a per-channel basis with the FRM_HXPIDLE[1:0]
(
Table 436
) parameter.