Broadcom NetXtreme/NetLink BCM5718 Series - Jumbo Replenish LWM Register (Offset 0 X2 D04)

Receive BD Initiator Control RegistersBCM5718 Programmer’s Guide
Broadcom®
January 29, 2016 • 5718-PG108-R Page 374
Jumbo Replenish LWM Register (offset 0x2D04)
Replenish Low Water Mark 7:0 RW 0x0 This field must be programmed with the desired
LWM for Standard RBD cache/memory. The
value equally applies to all VRQs. Whenever the
number of BDs in a VRQ’s BD memory falls
below this (LWM+1), a BD fetch is request
triggered.
Recommended Settings:
• Non-IOV mode:
STD LWM: 32. (1/4 of total RBDs)
• IOV mode:
STD LWM: 16. (1/2 of total RBDs)
Name Bits Access
Default
Value
Description
Legacy 31:8 RU 0x0 Unused
Replenish Low Water Mark 7:0 RW 0x0 This field must be programmed with the desired
LWM for Jumbo RBD cache/memory. The value
equally applies to all VRQs. Whenever the
number of BDs in a VRQ’s BD memory falls
below this (LWM+1), a BD fetch is request
triggered.
Recommended Settings:
• Non-IOV mode:
JMB LWM: 16. (1/4 of total RBDs)
• IOV mode:
JMB LWM: 4. (1/4 of total RBDs)
Name Bits Access
Default
Value
Description