Figure 8-22. use of transfer error acknowledge – IBM POWERPC 750GL User Manual
Page 315
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User’s Manual
IBM PowerPC 750GX and 750GL RISC Microprocessor
gx_08.fm.(1.2)
March 27, 2006
Bus Interface Operation
Page 315 of 377
Figure 8-22 shows the use of the TEA signal. Note that all bidirectional signals are tristated between bus
tenures. Also note:
• The first data beat of the read burst (in clock 0) is the critical quadword.
• The TEA signal truncates the burst write transfer on the third data beat.
• The 750GX eventually causes an exception to be taken on the TEA event.
Figure 8-22. Use of Transfer Error Acknowledge (TEA)
BR
BG
ABB
TS
A[0–31]
TT[0–4]
TBST
GBL
AACK
ARTRY
DBG
DBB
D[0–63]
TA
DRTRY
TEA
CPU A
In 0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17
CPU A
CPU A
Read
Write
Read
In 1
In 2
In 3
Out 0 Out 1 Out 2
In 0
In 1
In 3
In 2
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17
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