ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 366

• Manufacturer Part Number: ibm3206k0424
• Description: Ibm Processor For Network Resources
• Manufacturer: ETC-unknow

IBM3206K0424
IBM Processor for Network Resources
Preliminary
Entity 13: Receive Queues (RXQUE)
Functional Description
RXQUE has a single function: to manage the receive queues for software by providing an easy to use primi-
tive interface. When talking about the receive queues, the term rxq is used to talk about a receive queue, and
the term deq is used to refer to a dequeue operation, and the term enq is used to refer to an enqueue opera-
tion.
Receive Queue Interface
A group of sixteen receive queues is available for software use. The receive queues hold events or user
specified data.
Each queue entry (event) is either 32 or 64 bits and contains two fields: event-identifier and event-informa-
tion. The seven least significant bits in the entry contain the event-identifier field. The most significant bits in
the entry comprise the event-information field.
Warning: In order to maintain the atomicity of 64-bit atomic transfers, the user must ensure that 64-bit trans-
fers are bus atomic within the particular bus system in which IBM3206K0424 is being used.
The event information typically contains a pointer (when low order bits are zeroed) to a packet buffer, a cell
buffer, or an LCD. It can also contain a DMA descriptor address or user-specified data. Event Summary and
Routing Information on page 367 lists the different event types.
Receive Queues (RXQUE)
pnr25.chapt05.01
Page 366 of 676
August 14, 2000