zl50417 ETC-unknow, zl50417 Datasheet - Page 64

• Manufacturer Part Number: zl50417
• Description: Unmanaged 16-port 10/100m +2-port Ethernet Switch
• Manufacturer: ETC-unknow

64
13.7.23
I²C Address h0C0; CPU Address 516
Accessed by serial interface and I²C (R/W)
Buffer reservation for class 7 (highest priority). Granularity 1. (Default 0)
13.7.24
Accessed by serial interface and I²C (R/W):
C — QOSC00 – BYTE_C01 (I²C Address h0C1, CPU Address 517)
B — QOSC01 – BYTE_C02 (I²C Address h0C2, CPU Address 518)
A — QOSC02 – BYTE_C03 (I²C Address h0C3, CPU Address 519)
QOSC00 through QOSC02 represents one set of values A-C for a 10/100 port when using the Weighted Random
Early Drop (WRED) Scheme described in Chapter 7. There are four such sets of values A-C specified in Classes
Byte Limit Set 0, 1, 2, and 3.
Each 10/ 100 port can choose one of the four Byte Limit Sets as specified by the QoS Select field located in bits 5
to 4 of the ECR2n register. The values A-C are per-queue byte thresholds for random early drop. QOSC02
represents A, and QOSC00 represents C.
Granularity when Delay bound is used: QOSC02: 128 bytes, QOSC01: 256 bytes, QOSC00: 512 bytes. Granularity
when WFQ is used: QOSC02: 512 bytes, QOSC01: 512 bytes, QOSC00: 512 bytes.
13.7.25
Accessed by 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 Detect (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.
13.7.26
Accessed by 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 Detect (WRED) Scheme.
ZL50417
C7RS – Class 7 Reserve Size
QOSCn - Classes Byte Limit Set 0
Classes Byte Limit Set 1
Classes Byte Limit Set 2
7
Class 7 FCB Reservation
Zarlink Semiconductor Inc.
0
Data Sheet