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: 19/174页
文件大小: 1261K
代理商: DS3131
DS3131
115 of 174
Register Name:
TDMAQ
Register Description:
Transmit DMA Queues Control
Register Address:
0880h
Bit #
7
6
5
4
3
2
1
0
Name
reserved
TDQF
TDQFE
TPQF
TPQFE
Default
0
Bit #
15
14
13
12
11
10
9
8
Name
reserved
TDQT2
TDQT1
TDQT0
Default
0
Note:
Bits that are underlined are read-only; all other bits are read-write.
Bit 0/Transmit Pending-Queue FIFO Enable (TPQFE). See Section 9.3.3 for details.
Bit 1/Transmit Pending-Queue FIFO Flush (TPQLF). See Section 9.3.3 for details.
Bit 3/Transmit Done-Queue FIFO Enable (TDQFE). This bit must be set to 1 to enable the DMA to burst write
descriptors to the done queue. If this bit is set to 0, descriptors are written one at a time.
0 = done-queue burst write disabled
1 = done-queue burst write enabled
Bit 4/Transmit Done-Queue FIFO Flush (TDQF). When this bit is set to 1, the internal done-queue FIFO is
flushed by sending all data into the done queue. This bit must be set to 0 for proper operation.
0 = FIFO in normal operation
1 = FIFO is flushed
Bits 8 to 10/Transmit Done-Queue Status Bit Threshold Setting (TDQT0 to TDQT2). These bits determine
when the DMA sets the transmit DMA done-queue write (TDQW) status bit in the status register for DMA
(SDMA) register.
000 = set the TDQW status bit after each descriptor write to the done queue
001 = set the TDQW status bit after 2 or more descriptors are written to the done queue
010 = set the TDQW status bit after 4 or more descriptors are written to the done queue
011 = set the TDQW status bit after 8 or more descriptors are written to the done queue
100 = set the TDQW status bit after 16 or more descriptors are written to the done queue
101 = set the TDQW status bit after 32 or more descriptors are written to the done queue
110 = set the TDQW status bit after 64 or more descriptors are written to the done queue
111 = set the TDQW status bit after 128 or more descriptors are written to the done queue
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