IBM PowerPC 405GP

4:6 PT PLL Tuning Note: The tune bits adjust parameters that
000 Choice 1; TUNE[5:0] = 010001
control PLL jitter. The recommended values
001 Choice 2; TUNE[5:0] = 010010
minimize jitter for the PLL implemented in
010 Choice 3; TUNE[5:0] = 010011
the PPC405GP. These bits are shown for
011 Choice 4; TUNE[5:0] = 010100
information only, and do not require
100 Choice 5; TUNE[5:0] = 010101
modification except in special clocking
101 Choice 6; TUNE[5:0] = 010110
circumstances, such as spread spectrum
110 Choice 7; TUNE[5:0] = 010111
clocking. For details on the use of spread
111 Choice 8; TUNE[5:0] = 100100
spectrum clock generators (SSCGs) with
the
PPC405GP, visit the technical
documents area of the IBM PowerPC web
site.
7:8
PDC PLB Divider from CPU
00
Divide By 1
01 Divide By 2
10 Divide By 3
11 Divide· By 4
9:10 ODP OPB Divider from PLB
00
Divide By 1
01 Divide By 2
10 Divide By 3
11 Divide By 4
11 :12 PDP PCI Divider from PLB
00
Divide By 1
01 Divide By 2
10 Divide By 3
11 Divide By 4
13:14
EBDP External Bus Divider from PLB
00
Divide By 2
01 Divide By 3
10 Divide By 4
11 Divide By 5
15:16 RW
ROM Width
00 8-bit ROM
01 16-bit ROM
10
32-bit ROM
11 Reserved
17 RL
ROM Location
o 405GP Peripheral Attach
1
405GP PCI Attach
18
..
Rese·rved
19 PAME PCI Asynchronous Mode Enable
o Synchronous PCI Mode
1 Asynchronous Mode
20 Reserved
...
21
PAE PCI Arbiter Enable
o Internal Arbiter Disabled
1 Internal Arbiter Enabled
22:31
I
Reserved
9-2
PPC405GP User's Manual Preliminary