White Electronic Designs
4M x 32 SDRAM / 2M x 8 SDRAM
WED9LAPC2B16P8BC
EXTERNAL MEMORY SOLUTION FOR AGERE’S TAPC640 ATM PORT CONTROLLER
FEATURES
Clock speeds:
• SDRAM: 100 MHz
100% tested to timing requirements of TAPC640’s
memory interface
Packaging:
• 153 pin BGA, 14mm x 22mm
3.3V Operating supply voltage
Direct control interface to both the BRAM and
PRAM ports on the TAPC640
62% space savings vs. monolithic solution
Reduced system inductance and capacitance
DESCRIPTION
The WED9LAPC2B16P8BC is a 3.3V, 4M x 32 Synchronous
DRAM and a 2M x 8 Synchronous DRAM array packaged
in a 14mm x 22mm 153 lead BGA.
The WED9LAPC2B16P8BC provides the memory required
for the BRAM (Buffer Memory) and PRAM (Pointer Memory)
memory ports for Agere’s TAPC640 ATM port controller.
When used in conjunction with the WED9LAPC2C16V4BC,
which provides memory for the CRAM (Control Memory)
and VCRAM (Virtual Control Memory) memory ports, the
entire memory requirement of the LUCTAPC640 can be
met using these 2 BGA devices.
The WED9LAPC2B16P8BC is 100% tested to the timing
requirements of the TAPC640’s memory interface timing
for both Commercial and Industrial temperature ranges.
FIGURE 1 – PIN CONFIGURATION
Pinout BRAM and PRAM MCM — Top View
1
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
2
V
CC
B
DATA_A
B
DATA_A
V
SS
B
DATA_A
B
DATA_A
V
CC
B
DATA_B
B
DATA_B
V
SS
B
DATA_B
B
DATA_B
V
CC
P
DATA
P
DATA
P
DATA
P
DATA
3
B
DATA_A
B
DATA_A
B
DATA_A
B
DATA_A
B
DATA_A
B
DATA_A
B
DATA_B
B
DATA_B
B
DATA_B
B
DATA_B
B
DATA_B
B
DATA_B
V
CC
P
DATA
V
CC
V
CC
P
DATA
4
B
DATA_A
B
DATA_A
B
DATA_A
B
DATA_A
B
DATA_A
B
DATA_A
B
DATA_B
B
DATA_B
B
DATA_B
B
DATA_B
B
DATA_B
B
DATA_B
V
SS
V
SS
V
SS
P
DATA
P
DATA
5
V
SS
V
SS
V
CC
V
CC
V
CC
V
SS
V
SS
V
SS
V
CC
V
CC
V
CC
V
SS
V
SS
V
SS
V
SS
V
CC
V
CC
6
GCLK
V
SS
NC
V
CC
V
CC
V
CC
V
CC
V
CC
NC
NC
NC
NC
NC
NC
NC
V
CC
PCASN
7
V
SS
NC
NC
V
SS
V
SS
V
SS
V
SS
NC
NC
NC
NC
NC
NC
NC
NC
V
CC
PRASN
8
BWEN
V
CC
V
SS
V
SS
V
SS
V
SS
V
CC
V
SS
V
SS
V
SS
V
CC
V
SS
V
SS
V
SS
V
SS
PDQM
PWEN
9
BCASN
V
CC
BADDR9
BADDR7
BADDR5
BADDR3
V
CC
BADDR1
BADDR10
BADDR12
V
CC
PADDR8
PADDR6
PADDR4
PADDR2
PADDR0
PBS
BRASN
BDQM
BADDR11
BADDR8
BADDR6
BADDR4
V
CC
BADDR2
BADDR0
BADDR13
V
CC
PADDR9
PADD7
PADDR5
PADDR3
PADDR1
PADDR10
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
November 2001
Rev. 1
1
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
