参数资料
型号: DS3131
厂商: MAXIM INTEGRATED PRODUCTS INC
元件分类: Telecom IC:Other
英文描述: SPECIALTY TELECOM CIRCUIT, PBGA256
封装: 27 X 27 MM, PLASTIC, BGA-256
文件页数: 10/174页
文件大小: 1261K
代理商: DS3131
DS3131
107 of 174
9.3.3 Pending Queue
The host writes to the transmit pending queue the location of the readied descriptor, channel number, and
control information. The descriptor space is indicated through a 16-bit pointer, which the DMA uses
with the transmit packet-descriptor base address to find the exact 32-bit address of the associated
transmit packet descriptor.
Figure 9-17. Transmit Pending-Queue Descriptor
dword 0
unused
Status(3)
CHRST
PRI
unused(2)
HDLC CH#(6)
Descriptor Pointer (16)
Note:
The organization of the pending queue is not affected by the enabling of Big Endian.
dword 0; Bits 0 to 15/Descriptor Pointer. This 16-bit value is the offset from the transmit descriptor base
address to the first descriptor in a packet chain (can be a single descriptor) that is queued up for transmission.
dword 0; Bits 16 to 21/HDLC Channel Number. HDLC channel number, which can be from 1 to 40.
000000 (00h) = HDLC channel number 1
100111 (27h) = HDLC channel number 40
dword 0; Bits 22 to 23/Unused. Not used by the DMA. Can be set to any value by the host and is ignored by the
transmit DMA.
dword 0; Bit 24/Priority Packet (PRI). If this bit is set to 1, then this indicates to the transmit DMA that the
packet or packet chain pointed to by the descriptor pointer field should be transmitted immediately after the
current packet transmission (whether it be standard or priority) is complete.
dword 0; Bit 25/Channel Reset (CHRST). Under normal operating conditions, this bit should always be set to 0.
When an error condition occurs and the transmit DMA places the channel into an out-of-service state by setting
the channel enable (CHEN) bit in the transmit DMA configuration register to 0, the host can force the channel
active again by setting the CHRST bit to 1. Only the first descriptor loaded into the pending queue after an error
condition should have CHRST set to 1; all subsequent descriptors (until another error condition occurs) should
have CHRST set to 0. The transmit DMA examines this bit and forces the channel active (CHEN = 1) if CHRST is
set to 1. If CHRST is set to 0, then the transmit DMA does not modify the state of the CHEN bit. See Section 9.2.2
for more details about how error conditions are handled.
dword 0; Bits 26 to 28/Packet Status. Not used by the DMA. Can be set to any value by the host and is ignored
by the transmit DMA. This field is used by the transmit DMA when it writes to the done queue to inform the host
of the status of the outgoing packet data.
dword 0; Bits 29 to 31/Unused. Not used by the DMA. Can be set to any value by the host and is ignored by the
transmit DMA.
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