Programmer’s Guide BCM5722
10/15/07
Broadcom Corporation
Document 5722-PG101-R High-Priority Mailboxes Page 240
RECEIVE BD RETURN RING 4 CONSUMER INDEX REGISTER (OFFSET 0X29C–0X29F)
This register is applicable to BCM5722, BCM5755, BCM5755M, BCM5756M, and BCM5757 devices only.
The Receive BD Return Ring Index register contains the index of last the buffer descriptor for return ring 4 that has been
consumed. Host software writes this register whenever it updates the return ring 4. This register must be initialized to 0.
SEND BD RING HOST PRODUCER INDEX REGISTER (OFFSET 0X300–0X307)
The Send BD Ring Host Producer Index register contains the index of the next buffer descriptor for a given send ring that
will be produced in the host for the NIC to DMA into NIC memory. Host software writes this register whenever it updates the
given send ring. This register must be initialized to 0.
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