W255H Cypress Semiconductor Corp, W255H Datasheet - Page 2

• Manufacturer Part Number: W255H
• Manufacturer: Cypress Semiconductor Corp

Specifications of W255H

• Lead Free Status / Rohs Status: Not Compliant

Document #: 38-07255 Rev. *C
Pin Summary
SEL_DDR
SCLK
SDATA
BUF_IN
FBOUT
PWR_DWN#
DDR[6:11]T
DDR[6:11]C
DDR[0:5]T_SDRAM
[10,0,2,4,6,8]
DDR[0:5]C_SDRAM
[11,1,3,5,7,9]
VDD3.3_2.5
VDD2.5
GND
Pin Name
Pins
48
25
24
13
1
36
28, 30, 34, 39, 43, 45
27, 29, 33, 38, 42, 44
4, 6, 10, 15, 19, 21
5, 7, 11, 16, 20, 22
2, 8, 12, 17, 23
32, 37, 41, 47
3, 9, 14, 18, 26, 31, 35, 40, 46 Ground
Input to configure for DDR-ONLY mode or STANDARD SDRAM
mode.
1 = DDR-ONLY mode.
0 = STANDARD SDRAM mode.
When SEL_DDR is pulled HIGH or configured for DDR-ONLY mode, pin
4, 5, 6, 7, 10, 11,15, 16, 19, 20, 21, 22, 27, 28, 29, 30, 33, 34, 38, 39,
42, 43, 44 and 45 will be configured as DDR outputs.
Connect VDD3.3_2.5 to a 2.5V power supply in DDR-ONLY mode.
When SEL_DDR is pulled LOW or configured for STANDARD SDRAM
output, pin 4, 5, 6, 7, 10, 11, 15, 16, 19 and 20, 21, 22 will be configured
as STANDARD SDRAM outputs.Pin 27, 28, 29, 30, 33, 34, 38, 39, 42,
43, 44 and 45 will be configured as DDR outputs.
Connect VDD3.3_2.5 to a 3.3V power supply in STANDARD SDRAM
mode.
SMBus clock input
SMBus data input
Reference input from chipset. 2.5V input for DDR-ONLY mode; 3.3V
input for STANDARD SDRAM mode.
Feedback clock for chipset. Output voltage depends on VDD3.3_2.5V.
Active LOW input to enable power-down mode; all outputs will be
pulled LOW.
Clock outputs. These outputs provide copies of BUF_IN.
Clock outputs. These outputs provide complementary copies of
BUF_IN.
Clock outputs. These outputs provide copies of BUF_IN. Voltage swing
depends on VDD3.3_2.5 power supply.
Clock outputs. These outputs provide complementary copies of
BUF_IN when SEL_DDR is active. These outputs provide copies of
BUF_IN when SEL_DDR is inactive. Voltage swing depends on
VDD3.3_2.5 power supply.
Connect to 2.5V power supply when W255 is configured for
DDR-ONLY mode. Connect to 3.3V power supply, when W255 is
configured for standard SDRAM mode.
2.5V voltage supply
Pin Description
Page 2 of 10
W255