參數(shù)資料
型號(hào): MX98727
英文描述: SINGLE CHIP PCI/CARDBUS FAST ETHERNET CONTROLLER
中文描述: 單芯片的PCI / CARDBUS快速以太網(wǎng)控制器
文件頁數(shù): 27/71頁
文件大?。?/td> 389K
代理商: MX98727
27
P/N:PM0723
REV. 1.0, JUL. 13, 2000
MX98728EC
Host DMA Fragment Counter : FRAGCNT, Reg56/55/54h, RW
Bit
54.7-0
55.7-0
56.7-0
Symbol
FRAGCNT[7:0]
FRAGCNT[15:8]
FRAGCNT[23:16]
Description
Host DMA Fragment [23:0] : Used as a down counter to track word count in
all packet memory read by the host. The largest count value can be pro-
grammed is 16MB, and is decrement by 2 at every word transferred for 16bit
host bus or decrement by 4 at every word transferred for 32bit host bus from
packet memory to host. When the remaining count value is less than current
receive packet length then reg 9h. 0 bit ( FRAGI ) will be set , DREQB will be
disabled and an interrupt to host bus will be issued if reg 8h.0 ( FRAGIM ) is
also set by software. Initial counter value must be non-zero to enable this
Fragment counter function with interrupt and DREQB control. When inter-
rupt is asserted and DREQB is disabled, this counter must be re-programmed
and write 1 to FRAGI bit to clear up interrupt flag in order to resume pending
host DMA activities to the receive channel.
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