ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 437

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

Preliminary
16.3: CHKSM TCP/IP Checksum Data Register
The CHKSM TCP/IP Checksum Data Register collects the 16-bit, two’s complement, end-around-carry sum
of the bytes. The source data is zero padded if it starts/ends on an odd byte boundary. The CHKSM TCP/IP
Checksum Data Register collects the 16-bit, two’s complement, end-around-carry sum of the bytes. It can be
seeded with an initial value. If it is not cleared before running a checksum, the previous value will act as a
seed. This register can be cleared when starting a checksum operation by writing the CLIP bit in the CHKSM
Control Register or by writing upper bits of CHKSM Read/Write Count Register.
See CHKSM Control Register on page 440) for description of how to get/set current checksum alignment.
Length
Type
Address
Power On Value
Restrictions
16.4: CHKSM Ripple Base Register
This register is used as base of a ripple pattern when in test mode. This register forms the base for a ripple
pattern. Each consecutive byte will be incremented by one or eight in the pattern. The ripple mode must be
set in the Control Register to use this feature. The value of this register will change during the test operation.
If a write and compare operation are being performed, this register needs to be setup again for the second
operation.
Length
Type
Address
Power On Value
Restrictions
pnr25.chapt05.01
August 14, 2000
16 bits
Read/Write
Normal sum
Inverted sum
Swapped sum
Inverted swapped sum
X’0000’
Can only be written when CHKSM is not enabled (see EE bit in CHKSM Control
Register on page 440)
8 bits
Read/Write
XXXX 0A14
X’00’
Can only be written when CHKSM is not enabled (see EE bit in CHKSM Control
Register on page 440)
XXXX 0A08
XXXX 0A0c
XXXX 0A34
XXXX 0A38
On-chip Checksum and DRAM Test Support (CHKSM)
IBM Processor for Network Resources
Page 437 of 676
IBM3206K0424