CDCD5704 Datasheet, PDF (3/17 Pages) Texas Instruments – Rambus TM XDR TM CLOCK GENERATOR

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TERMINAL
NAME
NO.
BYPASS
14
CLK0
27
CLK0B
26
CLK1
24
CLK1B
23
CLK2
20
CLK2B
19
CLK3
17
CLK3B
16
EN
11
ID0
12
ID1
13
ISET
3
REFCLK
5
REFCLKB
6
SCL
9
SDA
10
VDD
15, 22, 28
VDDC
7
VDDP
1
VSS
4, 18, 21, 25
VSSC
8
VSSP
2
Table 1. TERMINAL FUNCTIONS
TYPE
Input
Output
Output
Output
Output
Output
Output
Output
Output
Input
Input
Input
Output
Input
Input
Input
Input
Power
Power
Power
Ground
Ground
Ground
DESCRIPTION
If 0, the PLL is bypassed and the PLL is switched off.
Output for Clock0
Complementary output for Clock0
Output for Clock1
Complementary output for Clock1
Output for Clock2
Complementary output for Clock2
Output for Clock3
Complementary output for Clock3
Output enable; if 0, all outputs are disabled.
Device ID, bit 0
Device ID, bit 1
Set clock driver current with external resistor
Reference clock input
Complementary reference clock input
Serial interface clock, 3.3-V compatible
Serial interface data, 3.3-V compatible
2.5-V power supply for outputs
2.5-V power supply for core
2.5-V power supply for PLL
Ground
Ground for core
Ground for PLL
CDCD5704
SCAS823 – DECEMBER 2006
SERIAL INTERFACE
The following section describes the serial interface programming. In general, the serial interface slave supports
byte-write/-read and word-write/-read protocol as defined in the SMBus or I²C specification.
Serial Interface Operation Requirement
The internal timing of the serial interface logic block in the CDCD5704 requires a timing reference derived from
the input clock (REFCLK). A reference clock must be present at the REFCLK pin for the serial interface to be
operational.
Serial Interface Device Address
A6
A5
A4
A3
A2
A1
A0
W/R
1
1
0
1
1
ID1
ID0
0/1
The device-ID is determined by the external pins ID0 and ID1. They are part of the device 8-bit address.
Therefore, four different devices (00, 01, 10, and 11) can be addressed via the same serial interface. The least
significant bit of the address designates a write or read operation.
R/W Bit:
0 = write to CDCD5704 device
1 = read from CDCD5704 device
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