IBM 970MP - page 16

Application Note
(Includes Differences for 970FX to 970MP)
IBM PowerPC® 970MP RISC Microprocessor Preliminary
5. Design Enhancements for PowerPC 970MP
Page 16 of 25
AppNote_970FX-MP_Differences_Body.fm.1.0
November 15, 2006
Section 11.4 of the 970FX User’s Manual are set to system dependent values during initialization, and must
account for these larger latencies in the 970MP. The range of values that may be specified for each of these
parameters for the 970MP is:
In addition, the definitions of STATLAT, SNOOPLAT, and SNOOPACC in 970MP have changed due to addi-
tional staging of bus signals internally. Thus, setting a STATLAT value of 24 in the register corresponds to a
delay of 22 bus beats between the last beat of the ADO packet and the first beat of the transfer-handshake
packet. Similarly, a value two larger than the actual bus delay must be programmed into the SNOOPLAT and
SNOOPACC registers on 970MP.
Table5-1. PowerPC 970MP Programmable Delay Parameters
Paramet er Min. Max
COMPACE 2 14
STATLAT 4 30
SNOOPLAT 6 12
SNOOPACC 9 24