GS1531 Data Sheet
1.2 Pin Descriptions
Table 1-1: Pin Descriptions
Pin
Number
A1
A2
Name
LF
VCO_VCC
Timing
Analog
–
Type
Output
Output
Power
Description
Control voltage to external voltage controlled oscillator. Nominally +1.25V
DC.
Power supply for the external voltage controlled oscillator. Connect to pin
7 of the GO1555/GO1525*. This pin is an output.
Should be isolated from all other power supplies.
*For new designs use GO1555
A3
VCO_GND
–
Output
Power
Ground reference for the external voltage controlled oscillator. Connect to
pins 2, 4, 6, and 8 of the GO1555/GO1525*. This pin is an output.
Should be isolated from all other grounds.
*For new designs use GO1555
A4, A5
VCO, VCO
Analog
Input
Differential inputs for the external VCO reference signal. For single ended
devices such as the GO1555/GO1525*, VCO should be AC coupled to
VCO_GND.
VCO is nominally 1.485GHz.
*For new designs use GO1555
A6, B5,
B6, C1,
C4, C5,
C6, C7,
C8, D1,
D2, D3,
D4, D7,
D8, E1,
E2, E3,
E7, F2,
F3, F7,
G1, G2,
G3, G7,
H1, H2,
H3, H7,
J1, J2,
J3, J4
A7
NC
–
–
No connect.
PCLK
–
Input
PARALLEL DATA BUS CLOCK
Signal levels are LVCMOS/LVTTL compatible.
HD 20-bit mode
HD 10-bit mode
SD 20-bit mode
SD 10-bit mode
PCLK = 74.25MHz or 74.25/1.001MHz
PCLK = 148.5MHz or 148.5/1.001MHz
PCLK = 13.5MHz
PCLK = 27MHz
A8, E8, K8
IO_VDD
–
Power
Power supply connection for digital I/O buffers. Connect to +3.3V DC
digital.
30573 - 7
February 2008
6 of 50
GENNUM [ GENNUM CORPORATION ]
