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DP8390D Datasheet(PDF) 36 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP8390D
Description  NIC Network Interface Controller
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8390D Datasheet(HTML) 36 Page - National Semiconductor (TI)

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130 Bus Arbitration and Timing (Continued)
REMOTE READ TIMING
1) The DMA reads byteword from local buffer memory and
writes byteword into latch increments the DMA address
and decrements the byte count (RBCR01)
2) A Request Line (PRQ) is asserted to inform the system
that a byte is available
3) The system reads the port the read strobe (RACK)is
used as an acknowledge by the Remote DMA and it goes
back to step 1
Steps 1 – 3 are repeated until the remote DMA is com-
plete
Note that in order for the Remote DMA to transfer a byte
from memory to the latch it must arbitrate access to the
local bus via a BREQ BACK handshake After each byte or
word is transferred to the latch BREQ is dropped If a Local
DMA is in progress the Remote DMA is held off until the
local DMA is complete
TLF8582 – 72
REMOTE WRITE TIMING
A Remote Write operation transfers data from the IO port
to the local buffer RAM The NIC initiates a transfer by re-
questing a byteword via the PRQ The system transfers a
byteword to the latch via IOW this write strobe is detected
by the NIC and PRQ is removed By removing the PRQ the
Remote DMA holds off further transfers into the latch until
the current byteword has been transferred from the latch
PRQ is reasserted and the next transfer can begin
1) NIC asserts PRQ System writes byteword into latch
NIC removes PRQ
2) Remote DMA reads contents of port and writes
byteword to local buffer memory increments address
and decrements byte count (RBCR01)
3) Go back to step 1
Steps 1 – 3 are repeated until the remote DMA is com-
plete
TLF8582 – 73
36


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