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10-16 March, 2003 Developer’s Manual
Intel
®
80200 Processor based on Intel
®
XScale
™
Microarchitecture
External Bus
10.3.3 Read Burst, Critical Word First Data Return
Figure 10-6 is the same as the last with one difference: CWF is asserted high on the first data cycle
of the return data. This indicates that the data is returning critical word first. In this case, since the
address requested was 0x248, the word pair containing that byte starting at 0x248 is returned first.
The data is then returned sequentially through the end of the cache line and starting over at the
beginning.
Figure 10-6. Read Burst, CWF
Rd Req.
0x248
Wrap
d(0x248)d(0x250)d(0x258) d(0x240)
ECC
0x0
1
1
0
0ns 25ns 50ns 75ns 100ns
MCLK
ADS#/LEN[2]
Lock/LEN[1]
W/R#/LEN[0]
A
DValid
CWF
D
BE#
DCB
Abort