
____________________________________________________ DS34T101, DS34T102, DS34T104, DS34T108
162 of 366
General_cfg_reg0 0x00
Bits
Data Element Name
R/W
Reset
Value
Description
[6:5]
Fq
R/W
0x0
SDRAM clock:
00 = 50 MHz
01 = 75 MHz
10 = Reserved
11 = Reserved for 100 MHz
[4:3]
Col_width
R/W
0x0
SDRAM columns and rows
00 = 8 bit (256 columns)
01 = 9 bit (512 columns)
10 = 10 bit (1K columns)
11 = 11 bit (2K columns)
[2:1]
CAS_latency
R/W
0x2
SDRAM CAS latency:
00 = {reserve value}
01 = 1
10 = 2
11 = 3
[0]
Rst_SDRAM_n
R/W
0x0
Resets SDRAM controller. Active low.
After all configuration bits of the SDRAM controller have
been written, the SDRAM controller must be reset by
taking this bit low then high.
General_cfg_reg1 0x04
Bits
Data Element Name
R/W
Reset
Value
Description
[31]
RTP_timestamp_generation_
mode
R/W
0x0
Indicates the RTP timestamp generation mode:
0 = Absolute mode
1 = Differential (common clock) mode
See the description of the TS field in
Table 10-16 for more
details.
[30:24]
Sw_packet_offset
R/W
0x04
The offset from the first byte of the packet to the start of
the CPU buffer.
For the Ethernet-to-CPU packets, 8 bytes are added
automatically to each configured value. For example, if
you intend to set the offset to 20 bytes, configure this
value to 12 bytes.
Allowed values are in the range of 4–127 (decimal) bytes.
[23:19]
Tx_payload_offset
R/W
0x00
Number of 32-bit words between the start of transmit
buffer to the control word or to start of the TDM payload if
the control word does not exist
[18]
Reserved
R/W
0x0
Must be set to zero
[17:10]
JBC_sig_base_add
R/W
0x060
Base address (8 MSbits) of Rx jitter buffer signaling
section in SDRAM
[9:6]
Tx_buf_base_add
R/W
0x2
Base address (4 MSbits) of transmit buffers in SDRAM
[5]
IP_version
R/W
0x0
The IP version of transmitted TDMoP packets. See
0 = Ipv4
1 = Ipv6
[4]
Dual_stack
R/W
0x0
The IP version of received TDMoP packets . See section
0 = Ipv4/Ipv6, according to IP_version field above
1 = Both Ipv4 and Ipv6 packets
[3]
Frames_count_check_en
R/W
0x1
Specifies whether to check received packets that are
CESoPSN structured with CAS bundles and discard those
that contain the wrong number of TDM frames
0 = Do not check
1 = Check
[2]
Reserved
R/W
0x0
Must be set to zero
[1:0]
JBC_data_base_add
R/W
0x0
Base address (2 MSbits) of Rx jitter buffer data section in
SDRAM