CY28359
Pin Description
Pin
Name
BUF_INA,
BUF_INB
PWR
I/O
Description
10
2
VDD2.5
I
Reference input from chipset. 2.5V input.
13,15,20
4,6,24
DDRA[0:2]C
DDRB[0:2]C
VDD2.5
VDD2.5
VDD2.5
O
O
O
Clock outputs. These outputs provide complementary
copies of BUF_INA & BUF_INB, respectively.
12,14,21
3,5,25
DDRA[0:2]T
DDRB[0:2]T
Clock outputs. These outputs provide copies of BUF_INA
& BUF_INB, respectively.
9
1
FB_OUTA
FB_OUTB
Feedback clock for chipset
18
SCLK
VDD2.5
VDD2.5
I
I/O
I
SMBus clock input. Has pull-up resistor
SMBus data input. Has pull-up resistor
Address Select Pin. Has pull-down resistor
2.5V voltage supply
19
SDATA
SEL_ADDR
VDD2.5
VSS
26
7,16,22,28
8,11,17,23,27
Ground
controller. For Block Write/Read operation, the bytes must be
accessed in sequential order from lowest to highest byte (most
significant bit first) with the ability to stop after any complete
byte has been transferred. For Byte Write and Byte Read
operations, the system controller can access individual
indexed bytes. The offset of the indexed byte is encoded in the
command code, as described in Table 1.
Serial Data Interface
To enhance the flexibility and function of the clock synthesizer,
a two-signal serial interface is provided. Through the Serial
Data Interface, various device functions, such as individual
clock output buffers, can be individually enabled or disabled.
The registers associated with the Serial Data Interface
initializes to their default setting upon power-up, and therefore
use of this interface is optional. The interface can also be
accessed during power down operation.
The Block Write and Block Read protocol is outlined in Table 2
while Table 3 outlines the corresponding Byte Write and Byte
Read protocol.The slave receiver address is 11010010 (D2h)
or 11011100 (DCh) depending on state of ADDRSEL.
Data Protocol
The clock driver serial protocol accepts Byte Write, Byte Read,
Block Write and Block Read operation from any external I2C
Table 1. Command Code Definition
Bit
Description
7
0 = Block Read or Block Write operation
1 = Byte Read or Byte Write operation
(6:5) 01
(4:0) Byte offset for Byte Read or Byte Write operation. For Block Read or Block Write operations, these bits should be '00000'
Rev 1.0,November 24, 2006
Page 2 of 7
SPECTRALINEAR [ SPECTRALINEAR INC ]
