參數(shù)資料
型號(hào): DS3134
英文描述: Chateau Channelized T1 And E1 And HDLC Controller
中文描述: 不推薦用于新設(shè)計(jì)
文件頁(yè)數(shù): 110/203頁(yè)
文件大?。?/td> 777K
代理商: DS3134
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DS3134
110 of 203
Register Name:
Register Description:
Receive DMA Queues Control
Register Address:
0780h
RDMAQ
7
6
5
4
3
2
1
0
n/a
15
n/a
n/a
14
n/a
RDQF
13
n/a
RDQFE
12
n/a
RFQSF
11
n/a
RFQLF
10
RDQT2
n/a
9
RFQFE
8
RDQT0
RDQT1
Note: Bits that are underlined are read only, all other bits are read-write; default value for all bits is 0.
Bit 0 / Receive Free Queue FIFO Enable (RFQFE).
To enable the DMA to burst read descriptors from
the Free Queue; this bit must be set to a one. If this bit is set to zero, descriptors will be read one at a
time.
0 = Free Queue Burst Read Disabled
1 = Free Queue Burst Read Enabled
Bit 2 / Receive Free Queue Large Buffer FIFO Flush (RFQLF).
When this bit is set to one, the
internal Large Buffer Free Queue FIFO will be flushed (currently loaded Free Queue Descriptors are lost).
This bit must be set to zero for proper operation.
0 = FIFO in normal operation
1 = FIFO is flushed
Bit 3 / Receive Free Queue Small Buffer FIFO Flush (RFQSF).
When this bit is set to one, the
internal Small Buffer Free Queue FIFO will be flushed (currently loaded Free Queue Descriptors are lost).
This bit must be set to zero for proper operation.
0 = FIFO in normal operation
1 = FIFO is flushed
Bit 4 / Receive Done Queue FIFO Enable (RDQFE).
See Section 8.1.4 for details.
Bit 5 / Receive Done Queue FIFO Flush (RDQF).
See Section 8.1.4 for details.
Bits 8 to 10 / Receive Done Queue Status Bit Threshold Setting (RDQT0 to RDQT2).
See Section
8.1.4 for details.
8.1.4 DONE QUEUE
The DMA will write to the Receive Done Queue when it has filled a free data buffer with packet data and
has loaded the associated Packet Descriptor with all the necessary information. The descriptor location is
indicated via a 16-bit pointer which the Host will use along with the Receive Descriptor Base Address to
find the exact 32-bit address of the associated Receive Descriptor.
Receive Done Queue Descriptor Figure 8.1.4A
dword 0
V EOF
Note:
1) Organization of the Done Queue is not affected by the enabling of Big Endian
2) Descriptor Pointer is an index and is not an absolute address.
Status (3)
BUFCNT(3)
HDLC Channel (8)
Descriptor Pointer (16)
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