MVTX2602
Data Sheet
91
Zarlink Semiconductor Inc.
Granularity when Delay bound is used: QOSC05: 128 bytes, QOSC04: 256 bytes, QOSC03: 512 bytes. Granularity
when WFQ is used: QOSC05: 512 bytes, QOSC04: 512 bytes, QOSC03: 512 bytes.
13.6.25 Classes Byte Limit Set 2
Accessed by CPU and serial interface (R/W):
C - QOSC06 – BYTE_C21 (CPU Address h51D)
B - QOSC07 – BYTE_C22 (CPU Address h51E)
A - QOSC08 – BYTE_C23 (CPU Address h51F)
QOSC06 through QOSC08 represents one set of values A-C for a 10/100 port when using the Weighted Random
Early Drop (WRED) scheme.
Granularity when Delay bound is used: QOSC08: 128 bytes, QOSC07: 256 bytes, QOSC06: 512 bytes.
Granularity when WFQ is used: QOSC08: 512 bytes, QOSC07: 512 bytes, QOSC06: 512 bytes.
13.6.26 Classes Byte Limit Set 3
Accessed by CPU and serial interface (R/W):
C - QOSC09 – BYTE_C31 (CPU Address h520)
B - QOSC10 – BYTE_C32 (CPU Address h521)
A - QOSC11 – BYTE_C33 (CPU Address h522)
QOSC09 through QOSC011 represents one set of values A-C for a 10/100 port when using the Weighted Random
Early Drop (WRED) scheme.
Granularity when Delay bound is used: QOSC11: 128 bytes, QOSC10: 256 bytes, QOSC09: 512 bytes.
Granularity when WFQ is used: QOSC11: 512 bytes, QOSC10: 512 bytes, QOSC09: 512 bytes.
13.6.27 Classes WFQ Credit Set 0
Accessed by CPU and serial interface
W0 - QOSC24[5:0] – CREDIT_C00 (CPU Address h52F)
W1 - QOSC25[5:0] – CREDIT_C01 (CPU Address h530)
W2 - QOSC26[5:0] – CREDIT_C02 (CPU Address h531)
W3 - QOSC27[5:0] – CREDIT_C03 (CPU Address h532)
QOSC24 through QOSC27 represents one set of WFQ parameters for a 10/100 port. There are four such sets of
values. The granularity of the numbers is 1 and their sum must be 64. QOSC27 corresponds to W3 and QOSC24
corresponds to W0.
QOSC24[7:6]: Priority service type for the ports select this parameter set. Option 1 to option 4.
QOSC25[7]: Priority service allow flow control for the ports select this parameter set.
QOSC25[6]: Flow control pause best effort traffic only.
Both flow control allow and flow control best effort only can take effect only the priority type is WFQ.