ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 351

• Manufacturer Part Number: ibm3206k0424
• Description: Ibm Processor For Network Resources
• Manufacturer: ETC-unknow

Preliminary
12.30: RXAAL Transmit Queue Length Compression Configuration
This register allows the user to configure how the transmit queue lengths should be compressed for use in the
receive packet header. CSKED provides twelve transmit queue lengths specified in bytes. A 32-bit register
(the Bytes Queued Counters in CSKED) is available for the high, medium, and low priority queues for each of
the four PHY ports. Using the full counts in the receive packet header generally uses too much room. This
register allows the user to configure how this information should be compressed for use in the receive packet
header.
Length
Type
Address
Power On Value
Restrictions
pnr25.chapt05.01
August 14, 2000
Bit(s)
3-0
The following are the options:
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Use the full register representation for port zero only (3 - 32 bit words)
Use the 2K scaled representation for port zero only (1 - 32 bit words)
Use the 4K scaled representation for port zero only (1 - 32 bit words)
Use the 8K scaled representation for port zero only (1 - 32 bit words)
Use the 16K scaled representation for port zero only (1 - 32 bit words)
Use the 32K scaled representation for port zero only (1 - 32 bit words)
Use the 64K scaled representation for port zero only (1 - 32 bit words)
Use the 128K scaled representation for port zero only (1 - 32 bit words)
Reserved
Use the 2K scaled representation for all ports (3 - 32 bit words)
Use the 4K scaled representation for all ports (3 - 32 bit words)
Use the 8K scaled representation for all ports (3 - 32 bit words)
Use the 16K scaled representation for all ports (3 - 32 bit words)
Use the 32K scaled representation for all ports (3 - 32 bit words)
Use the 64K scaled representation for all ports (3 - 32 bit words)
Use the 128K scaled representation for all ports. (3 - 32 bit words)
For example, using option "0001," a single 32-bit word is used. The most significant byte contains the transmit
queue length for the high priority queue for port zero divided by 2K bytes. If the scaled count overflows (greater
than 2K*0xff), a value of 0xff is used. The next byte contains the scaled count for the medium priority queue,
and the third byte contains the scaled count for the low priority queue. The least significant byte is not used.
Using option "1010" three 32-bit words are used. The first word contains the scaled counts for the high priority
queue. The second word contains the scaled counts for the medium priority queue. The third word contains the
scaled counts for the low priority queue. Within each word, the first byte contains the scaled count for port zero,
and the subsequent bytes are used for the other ports (1, 2, 3). The counts are divided by 4K in this case.
4 bits
Read/Write
XXXX 1730
X’00000000’
None
Description
IBM Processor for Network Resources
Cell/Packet Re-assembly (REASM)
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IBM3206K0424