
MVTX2603
Data Sheet
58
Zarlink Semiconductor Inc.
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.
13.6.28 Classes Byte Limit Giga Port 1
Accessed by serial interface and I
2
C (R/W)
F - QOSC12 – BYTE_C2_G1 (I
2
C Address h0C7, CPU Address 523)
E - QOSC13 – BYTE_C3_G1 (I
2
C Address h0C8, CPU Address 524)
D - QOSC14 – BYTE_C4_G1 (I
2
C Address h0C9, CPU Address 525)
C - QOSC15 – BYTE_C5_G1 (I
2
C Address h0CA, CPU Address 526)
B - QOSC16 – BYTE_C6_G1 (I
2
C Address h0CB, CPU Address 527)
A - QOSC17 – BYTE_C7_G1 (I
2
C Address h0CC, CPU Address 528)
QOSC12 through QOSC17 represent the values A-F for Gigabit port 24. They are per-queue byte thresholds for
random early drop. QOSC17 represents A, and QOSC12 represents F.
Granularity when Delay bound is used: QOSC17 and QOSC16: 256 bytes, QOSC15 and QOSC14: 512 bytes,
QOSC13 and QOSC12: 1024 bytes.
Granularity when WFQ is used: QOSC17 to QOSC12: 1024 bytes
13.6.29 Classes Byte Limit Giga Port 2
Accessed by serial interface and I
2
C (R/W)
F - QOSC18 – BYTE_C2_G2 (I
2
C Address h0CD, CPU Address 529)
E - QOSC19 – BYTE_C3_G2 (I
2
C Address h0CE, CPU Address 52a)
D - QOSC20 – BYTE_C4_G2 (I
2
C Address h0CF, CPU Address 52b)
C - QOSC21 – BYTE_C5_G2 (I
2
C Address h0D0, CPU Address 52c)
B - QOSC22 – BYTE_C6_G2 (I
2
C Address h0D1, CPU Address 52d)
A - QOSC23 – BYTE_C7_G2 (I
2
C Address h0D2, CPU Address 52e)
QOSC18 through QOSC23 represent the values A-F for Gigabit port 2. They are per-queue byte thresholds for
random early drop. QOSC23 represents A, and QOSC18 represents F.
Granularity when Delay Bound is used: QOSC23 and QOSC22: 256 bytes, QOSC21 and QOSC20: 512 bytes,
QOSC19 and QOSC18: 1024 bytes.
Granularity when WFQ is used: QOSC18 to QOSC23: 1024 bytes
13.6.30 Classes WFQ Credit Set 0
Accessed by serial interface (R/W)
W0 - QOSC24[5:0] – CREDIT_C00 (CPU Address 52f)
W1 - QOSC25[5:0] – CREDIT_C01 (CPU Address 530)
W2 - QOSC26[5:0] – CREDIT_C02 (CPU Address 531)
W3 - QOSC27[5:0] – CREDIT_C03 (CPU Address 532)