ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 252

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

IBM3206K0424
IBM Processor for Network Resources
The lower seventeen bits of the virtual address are used in conjunction with the segment template in the
VIMEM Virtual Buffer Segment Size Register to determine from which portion of the buffer map the buffer
index is retrieved. Once the buffer index is retrieved, it is combined with the appropriate base address for that
particular buffer size. The offset into the buffer is then added to get the real 32-bit address that is used in
physical memory.
POOLS uses the data structures above to manage Packet Memory resources. Each LCD is associated with a
particular POOL and multiple different LCDs may be associated with that same POOL. Within a POOL, there
are five different resource categories and two variables to go with each resource.
Resources and Variables Example
9.1: POOLS Get Pointer Primitive
The POOLS Get Pointer Primitive returns a pointer to the requester. The request to the virtual packet/buffer
size 4 address will always return a memory address. If in virtual mode, the address will be virtual. Requests
made for buffer sizes 0 to 3 will not return an address but rather a buffer index in bits 15-0. The real address
associated with this index can be generated by shifting the index by the buffer size (for example, six bit posi-
tions for a 64-byte buffer) and adding the result to the base address for this size buffer. Access to buffer sizes
0 to 3 is not permitted in operational mode.
The address of the primitive also selects the pool ID. The pool ID is contained in address bits 5-2, and it
selects which pool will be charged for the pointer. The buffer size is selected with address bits 8-6.
If there are no more pointers available in the specified pool, a null pointer is returned. The active pointer count
for that pool is incremented if a non-null pointer is returned. If the guaranteed threshold has been exceeded
and a buffer from the common pool is returned, the common pools count for that size is decremented by 1.
Length
Type
Address
Power on Value
Restrictions
Buffer Pool Management (POOLS)
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Virtual Memory Addresses
Buffer Type One
Buffer Type Two
Buffer Type Three
Buffer Type Four
Virtual Memory Addresses
Resource Type, Pool 0000
32 bits
Read Only
Buffer Size 0
Buffer Size 1
Buffer Size 2
Buffer Size 3
Virtual Packets/
Buffer Size 4
X’00000000’
During normal operations this register is to be used as a read only register. Writes to
this address will be ignored.
Guaranteed Number
XXXX 3200
XXXX 3240
XXXX 3280
XXXX 32C0
XXXX 3300
100
200
100
50
10
0
Total Number
150
300
100
150
10
5
pnr25.chapt04.01
August 14, 2000
Preliminary