ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 202

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

IBM3206K0424
IBM Processor for Network Resources
6.4: VIMEM Packet Memory Base Address
This register defines the starting address of the Packet Memory address space. Any time an access is made
to Packet Memory, the contents of this register are subtracted from the address before an access to memory
occurs.
Length
Type
Address
Power On Value
Restrictions
ATM Virtual Memory Logic (VIMEM)
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31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
Bit(s0
31-17
16-0
Base Address of Real Packet Memory
These bits contain the upper 15 bits of the base address of real Packet Memory.
These bits will be forced to ‘0’ because the real Packet Memory base address must start on a 128KB boundary.
32 bits
Read/Write
XXXX 0D18
X’0020 0000’
The start of real packet address space must begin on a 128KB boundary. For this
reason, the lowest 17 bits of this register are forced to ’0’ and are not implemented.
Writes of any value to the low 17 bits of this register are ignored, and a read always
returns ‘0’ for the low 17 bits. This register must also be set up before any of the
Real Buffer Base Registers, or the Virtual Buffer Map Registers are written.
Description
128KB Boundary Restriction
9
8
7
6
5
4
pnr25.chapt04.01
August 14, 2000
3
Preliminary
2
1
0