PXF4336 Datasheet, PDF (130/425 Pages) Infineon Technologies AG – ABM Premium ATM Buf fer Manager

ABM-P
PXF 4336 V1.1
Functional Description
3.6.10.2 Emit FIFO Organization (IOP/FW View)
This FIFO stores Emit and time-out events from both cores. Each event is stored in 3
successive 16-bit words. The mapping of the parameters in the 3 words depends on the
event type:
Table 3-61 Emit FIFO Entry for Emit Events
w\b 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0
Tnow(19:16) ^Core
QID(10:0)
1
00
Qlen(13:0)
2
Tnow(15:0)
Core
Indicates upstream(0) or downstream (1) emit event
QID(10:0)
2k-1 QID (range 1 to 2047), only 1k-1 (even numbers) used for ABR;
QID 0 is reserved for CRT bypass
Tnow(19:0)
Cell emit time for rate calculation in ER algorithm. Tnow counts cell
cycles. The granularity Tnow is defined by the global parameter
TstepC, located in Register 70 "USCONF/DSCONF" on Page 295
and calculated as follows:
Granularity of Tnow = 2 ** TstepC
Qlen
Queue length from Buffer Manager for ER algorithm
Table 3-62 Emit FIFO Entry for Time-out Events in VS/VD Mode
w\b 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0
0 0 0 0 ^Core
QID(10:0)
1 ^{ToT ToA} 0 0 0 0 0 0 0 0 0 0 0 0 0 0
2
0000000000000000
Core
Indicates upstream(0) or downstream (1) rate control
QID(10:0)
2k-1 QID (range 1 to 2047), only 1k-1 (even numbers) used for ABR;
QID 0 is reserved for CRT bypass
ToT
1 if time-out event Trm (set by SCAN)
ToA
1 if time-out event ADTF (set by SCAN)
Table 3-63 Emit FIFO Entry for Time-out Events in ER Mode
w\b 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0
0 0 0 0 ^Core
QID(10:0)
1 ^{ToF ToB} 0 0 0 0 0 0 0 0 0 0 0 0 0 0
2
0000000000000000
Data Sheet
130
2001-12-17