Eight-Word Inbound Write; Eight-Word Inbound Write With Nops - Intel IXP45X Developer's Manual

Expansion Bus Controller—Intel
Processors
Figure 153. Eight-Word Inbound Write
- 0 - - 1 -
EX_CLK
EX_IXPCS _N
EX_ADDR
ADDR 0
EX_RD_N
EX_WR _N
EX_BE_N
EX_BURST
EX_WAIT _N
EX_DATA
EX_PARITY
STATE
IDLE DATA 0
12.4.5.5

Eight-Word Inbound Write with NOPS

Figure 154. Eight-Word Inbound Write with NOPS
- 0 - - 1 -
EX_ CLK
EX_ IXPCS_N
EX_ ADDR
ADDR0
EX_RD_N
EX_WR_N
EX_BE_N
EX_ BURST
EX_ WAIT_N
EX_ DATA
EX_ PARITY
STATE
IDLE NOP
Figure 154
3, and in cycle 11 of a 8-word write. The external master can insert NOPS at anytime in
the burst and the cycle will be ignored. Since the master started the burst with a NOP,
EX_WAIT_N may have been asserted in cycle 2. In the above example, the Expansion
bus controller did not assert EX_WAIT_N in cycle 2, therefore the external master
August 2006
Order Number: 306262-004US
® ®
IXP45X and Intel IXP46X Product Line of Network
- 2 - - 3 - - 4 - - 5 -
ADDR 1
DATA 0
PAR 0
DATA 0 DATA 0 DATA 1
- 2 - - 3 - - 4 - - 5 -
ADDR1 ADDR2
DATA0 DATA1
DATA1 PAR1
DATA0 DATA0 NOP DATA1
shows an external master choosing to insert NOP cycles at the start, in cycle
- 6 - - 7 - - 8 -
ADDR 2
DATA 1 DATA 2
PAR 1 PAR 2
DATA 1 DATA 2 DATA 2
- 6 - - 7 - - 8 - - 9 -
ADDR3 ADDR4 ADDR5
DATA2 DATA3 DATA4
PAR2 PAR3 PAR4
DATA2 DATA3 DATA4
® ®
Intel IXP45X and Intel IXP46X Product Line of Network Processors
- 9 - - 10 - - 11 -
ADDR 7
DATA 7
PAR 7
DATA 7 DATA 7
- 10 - - 11 - - 12 -
ADDR6 ADDR 7
DATA5 DATA6 DATA7
PAR5 PAR6 PAR7
DATA5 DATA6 DATA7 NOP
Developer's Manual
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IDLE
B4441-01
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IDLE
B4442-01
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