參數(shù)資料
型號(hào)： W89C880F
英文描述： LAN Hub Controller
中文描述： 局域網(wǎng)集線器控制器
文件頁(yè)數(shù)： 58/72頁(yè)
文件大?。?/td> 731K
代理商： W89C880F
W89C840F
- 58 -
Bit
Symbol
Description
25
RLAST
Last Descriptor of the Ring.
When set, it indicates the current descriptor is the last receive descriptor ring.
This bit preempts the bit 24 (RLINK)of this descriptor. It means that the next
descriptor pointer of the receive DMA state machine will automatically jump to
the first descriptor pointed by the content of the register C0C/CTDLA, even the
RLINK bit is set to high and the descriptor R03 points to an address other than
the one specified by the register C0C/CRDLA. The RLAST is valid on each
descriptor.
24
RLINK
Link Address in Receive Buffer Address 2
When set, it indicates that receive Buffer Address 2 in the descriptor R03
contains the start address of the next descriptor of the descriptor list. Otherwise
the descriptor R03 will point to the start address of the receive buffer 2 when the
RLINK is reset. The RLINK is valid on each descriptor.
23:12
RSZ2
Receive Buffer Size 2.
The RSZ2 indicates the size, in bytes, of the second data buffer pointed by the
current descriptor. If this field is 0, the W89C840F ignores this buffer. The buffer
size must be long word aligned. The maximum size for this buffer is 4093 bytes.
11:0
RSZ1
Receive Buffer Size 1.
The RSZ1 indicates the size, in bytes, of the first data buffer pointed by the
current descriptor. If this field is 0, the W89C840F will ignore this buffer. The
buffer size must be longword aligned. The maximum size of this buffer is 4093
bytes.
R02, Receive Descriptor 2
The R02 is used to specify the receive buffer 1 start address
Bit
Symbol
Description
31:0
RBA1
Receive Buffer Address 1
The RBA1 indicates the physical address, in the host memory space, of the first
receive buffer pointed by the current descriptor. The RBA1 must be longword
aligned. It is valid on each descriptor of the current frame.
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