PXF4333 Datasheet, PDF (139/361 Pages) Infineon Technologies AG – ABM 3G ATM Buf fer Manager

ABM-3G
PXF 4333 V1.1
Interface Description
The minimum required width of the cell pointer SSRAM is in the range 16..20 bits
depending on the selected Cell Storage Size and additional feature configurations:
Table 5-10 SSRAM Configuration Examples
Cell Storage RAM Enabled
cell capacity
Features
(each)
Stored
Address
Pointer
Width
Feature
Bits
Min. SSRAM
Width
256K
VBR.2/3 +
18
2
20
EOP marking
EOP marking 18
1
19
none
18
0
18
128K
VBR.2/3 +
17
2
19
EOP marking
EOP marking 17
1
18
none
17
0
17
64K
VBR.2/3 +
16
2
18
EOP marking
EOP marking 16
1
17
none
16
0
16
Note: VBR.2/3 represents VBR shaping function 2 and 3 requiring one additional bit
storage in the CPR for the CLP bit.
EOP marking represents one additional bit storage in the CPR for End-of-Packet
indication required by EPD/PPD and VC-Merge operation.
Table 5-11 gives an example of supported SDRAM configuration:
Data Sheet
139
2001-12-17