ICS94241 Datasheet, PDF (6/16 Pages) Integrated Circuit Systems – Programmable TCH™ for Differential PIII™ Processor

ICS94241
Byte 1: CPU, Active/Inactive Register
(1= enable, 0 = disable)
BIT
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PIN#
-
-
-
-
40
-
43
44
PWD
DESCRIPTION
X Latched FS2#
1 (Reserved)
1 (Reserved)
1 (Reserved)
1 SDRAM0
1 (Reserved)
1 CPUCLK0
1 CPUCLK_CS
Byte 2: PCI, Active/Inactive Register
(1= enable, 0 = disable)
BIT
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PIN#
-
6
13
12
11
10
9
7
PWD
DESCRIPTION
1 (Reserved)
1 PCICLK0
1 PCICLK6
1 PCICLK5
1 PCICLK4
1 PCICLK3
1 PCICLK2
1 PCICLK1
Byte 3: SDRAM, Active/Inactive Register
(1= enable, 0 = disable)
BIT
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PIN#
-
-
26
25
-
17, 18,
20, 21
28, 29,
31, 32
34, 35,
37, 38
PWD
DESCRIPTION
1 (Reserved)
X Latched FS0#
1 48MHz
1 24 MHz
1 (Reserved)
1 SDRAM (12:9)
1 SDRAM (8:5)
1 SDRAM (4:1)
Byte 4: Reserved , Active/Inactive Register
(1= enable, 0 = disable)
BIT PIN# PWD
DESCRIPTION
Bit 7 -
1 (Reserved)
Bit 6 -
1 (Reserved)
Bit 5 -
1 (Reserved)
Bit 4 -
1 (Reserved)
Bit 3 -
X Latched FS1#
Bit 2 -
X Latched FS4#
Bit 1 -
Bit 0 -
X Latched FS3#
1 (Reserved)
Byte 5: Peripheral , Active/Inactive Register
(1= enable, 0 = disable)
BIT
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PIN# PWD
DESCRIPTION
-
1 (Reserved)
-
1 (Reserved)
-
1 (Reserved)
-
1 (Reserved)
-
1 (Reserved)
-
1 (Reserved)
46
1 REF1
47
1 REF0
Notes:
1. Inactive means outputs are held LOW and are disabled
from switching.
2. Latched Frequency Selects (FS#) will be inverted logic
0453^lC^o—^a1^d0/2^o6/^f04^{the input frequency select pin conditions.}
Byte 6: Peripheral , Active/Inactive Register
(1= enable, 0 = disable)
BIT PIN# PWD
DESCRIPTION
Bit7 -
0 Reserved (Note)
Bit6 -
1 Reserved (Note)
Bit5 -
X Reserved (Note)
Bit4 -
X Reserved (Note)
Bit3 -
X Reserved (Note)
Bit2 -
X Reserved (Note)
Bit1 -
X Reserved (Note)
Bit0 -
X Reserved (Note)
Note: This is an unused register writing to this register
will not affect device performance or functinality.
6