ZL50418 Datasheet, PDF (92/163 Pages) Zarlink Semiconductor Inc – Managed 16-Port 10/100 M + 2-Port 1 G Ethernet Switch

ZL50418
Data Sheet
14.9.25 Classes Byte Limit Set 1
Accessed by CPU, serial interface and I²C (R/W):
• C - QOSC03 – BYTE_C11 (I²C Address h0C4, CPU Address 51a)
• B - QOSC04 – BYTE_C12 (I²C Address h0C5, CPU Address 51b)
• A - QOSC05 – BYTE_C13 (I²C Address h0C6, CPU Address 51c)
QOSC03 through QOSC05 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: QOSC05: 128 bytes, QOSC04: 256 bytes, QOSC03: 512 bytes. Granularity
when WFQ is used: QOSC05: 512 bytes, QOSC04: 512 bytes, QOSC03: 512 bytes.
14.9.26 Classes Byte Limit Set 2
Accessed by CPU and serial interface (R/W):
• C - QOSC06 – BYTE_C21 (CPU Address 51d)
• B - QOSC07 – BYTE_C22 (CPU Address 51e)
• A - QOSC08 – BYTE_C23 (CPU Address 51f)
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
14.9.27 Classes Byte Limit Set 3
Accessed by CPU and serial interface (R/W):
• C - QOSC09 – BYTE_C31 (CPU Address 520)
• B - QOSC10 – BYTE_C32 (CPU Address 521)
• A - QOSC11 – BYTE_C33 (CPU Address 522)
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
14.9.28 Classes Byte Limit Giga Port 1
Accessed by CPU, serial interface and I²C (R/W):
• F - QOSC12 – BYTE_C2_G1 (I²C Address h0C7, CPU Address 523)
• E - QOSC13 – BYTE_C3_G1 (I²C Address h0C8, CPU Address 524)
• D - QOSC14 – BYTE_C4_G1 (I²C Address h0C9, CPU Address 525)
• C -QOSC15 – BYTE_C5_G1 (I²C Address h0CA, CPU Address 526)
• B - QOSC16 – BYTE_C6_G1 (I²C Address h0CB, CPU Address 527)
• A - QOSC17 – BYTE_C7_G1 (I²C Address h0CC, CPU Address 528)
QOSC12 through QOSC17 represent the values A-F for Gigabit port 1. They are per-queue byte thresholds for
random early drop. QOSC17 represents A and QOSC12 represents F.
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Zarlink Semiconductor Inc.