9UMS9001
PC MAIN CLOCK - CK540
Advance Information
Pin Description (continued)
PIN #
PIN NAME
TYPE
DESCRIPTION
Clock request input for SRC output pair 0. See the SRC, LCD, DOT Power Management Table for
details
29
CKLREQ0#
IN
Complement side of low-power CK505-type SRC0 differential clock. Rs is integrated (No external
series resistor required).
True side of low-power CK505-type SRC0 differential clock. Rs is integrated (No external series
resistor required).
Complement side of low-power CK505-type SRC1 differential clock. Rs is integrated (No external
series resistor required).
True side of low-power CK505-type SRC1 differential clock. Rs is integrated (No external series
resistor required).
30
31
32
33
SRC0C_LPRS
SRC0T_LPRS
SRC1C_LPRS
SRC1T_LPRS
OUT
OUT
OUT
OUT
34
35
GNDSRC
PWR Ground for SRC clocks
VDDIO_SRC
PWR Power supply for SRC outputs. VDD_IO = 1.05 to 3.3V +/-5%.
Complement side of low-power CK505-type SRC2 differential clock. Rs is integrated (No external
series resistor required).
True side of low-power CK505-type SRC2 differential clock. Rs is integrated (No external series
resistor required).
Complement side of low-power CK505-type SRC3 differential clock. Rs is integrated (No external
series resistor required).
36
37
38
SRC2C_LPRS
SRC2T_LPRS
SRC3C_LPRS
OUT
OUT
OUT
True side of low-power CK505-type SRC3 differential clock. Rs is integrated (No external series
resistor required).
PWR 3.3V Power supply for 3.3V core
39
40
41
SRC3T_LPRS
VDDCORE_3.3
CLKREQ3#
OUT
Clock request input for SRC output pair 2. See the SRC, LCD, DOT Power Management Table for
details
IN
Clock request input for SRC output pair 2. See the SRC, LCD, DOT Power Management Table for
details
42
CLKREQ2#
IN
Low threshold Frequency Select input. See Table 1: CPU Frequency Select Table and the Vih_fs and
Vil_fs specifications.
IN Stops all CPU clocks except those set to be free running.
43
44
45
FSLB
IN
CPU_STOP#
CPUITPC_LPRS
Complement side of low-power CK505-type CPUITP differential clock. Rs is integrated (No external
series resistor required). Note that this pin is NOT muxed with an SRC output.
OUT
True side of low-power CK505-type CPUITP differential clock. Rs is integrated (No external series
resistor required).
Complement side of low-power CK505-type CPU1 differential clock. Rs is integrated (No external
series resistor required). Note that this pin is NOT muxed with an SRC output.
True side of low-power CK505-type CPU1 differential clock. Rs is integrated (No external series
resistor required).
46
47
48
CPUITPT_LPRS
CPU1C_LPRS
CPU1T_LPRS
OUT
OUT
OUT
49
50
VDDIO_CPU
GNDCPU
PWR Power supply for CPU outputs. VDD_IO = 1.05 to 3.3V +/-5%.
PWR Ground Pin for CPU Outputs
Complement side of low-power CK505-type CPU1 differential clock. Rs is integrated (No external
series resistor required). Note that this pin is NOT muxed with an SRC output.
51
CPU0C_LPRS
OUT
True side of low-power CK505-type CPU1 differential clock. Rs is integrated (No external series
resistor required).
PWR 3.3V Power Supply for CPU PLL.
52
53
CPU0T_LPRS
OUT
VDDCPUPLL_3.3
Notifies 9UMS9001 to sample latched inputs or enter power down mode.
1 = Power down mode
Falling Edge = Sample latched inputs
54
CK_PWRGD#/PD
IN
0 = Normal operation
Low threshold Frequency Select input. See Table 1: CPU Frequency Select Table and the Vih_fs and
Vil_fs specifications.
55
56
FSLC
IN
GNDREF
PWR Ground pin for crystal oscillator circuit and REF output
IDT® PC MAIN CLOCK - CK540
1247B—07/19/10
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