HIGH-SPEED 2.5V
512/256K x 18
PRELIMINARY
IDT70T633/1S
ASYNCHRONOUS DUAL-PORT
STATIC RAM
WITH 3.3V 0R 2.5V INTERFACE
◆
Features
Full hardware support of semaphore signaling between
ports on-chip
On-chip port arbitration logic
Fully asynchronous operation from either port
Separate byte controls for multiplexed bus and bus
matching compatibility
Sleep Mode Inputs on both ports
Supports JTAG features compliant to IEEE 1149.1 in
BGA-208 and BGA-256 packages
Single 2.5V (±100mV) power supply for core
LVTTL-compatible, selectable 3.3V (±150mV)/2.5V (±100mV)
power supply for I/Os and control signals on each port
Available in a 256-ball Ball Grid Array, 144-pin Thin Quad
Flatpack and 208-ball fine pitch Ball Grid Array
Industrial temperature range (–40°C to +85°C) is available
for selected speeds
◆
True Dual-Port memory cells which allow simultaneous
access of the same memory location
High-speed access
◆
◆
◆
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– Commercial:8/10/12/15ns(max.)
– Industrial: 10/12ns(max.)
◆
RapidWrite Mode simplifies high-speed consecutive write
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cycles
◆
Dual chip enables allow for depth expansion without
external logic
◆
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IDT70T633/1 easily expands data bus width to 36 bits or
more using the Master/Slave select when cascading more
than one device
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M/S = VIH for BUSY output flag on Master,
M/S = VIL for BUSY input on Slave
Busy and Interrupt Flags
◆
Functional Block Diagram
UBL
UB
R
LBL
LB
R
R/WL
R/WR
B
E
0
L
B
E
1
L
B
E
1
B
E
0
CE0L
CE0R
R
R
CE1L
CE1R
OEL
OER
Dout0-8_L
Dout9-17_L
Dout0-8_R
Dout9-17_R
512/256K x 18
MEMORY
ARRAY
Din_L
I/O0L- I/O17L
Din_R
I/O0R - I/O17R
(1)
A
A
18R
0R
(1)
Address
Decoder
Address
Decoder
A
18L
ADDR_L
ADDR_R
A
0L
TDI
TCK
TMS
TRST
JTAG
OE
L
OER
ARBITRATION
TDO
INTERRUPT
SEMAPHORE
LOGIC
CE0R
CE1R
CE0L
CE1L
R/WL
R/W
R
(2,3)
L
(2,3)
R
BUSY
SEM
INT
BUSY
SEM
M/S
L
R
(3)
(3)
R
L
INT
ZZ
CONTROL
LOGIC
(4)
(4)
ZZR
ZZ
L
NOTES:
1. Address A18x is a NC for IDT70T631.
2. BUSY is an input as a Slave (M/S=VIL) and an output when it is a Master (M/S=VIH).
5670 drw 01
3
BUSY and INT are non-tri-state totem-pole outputs (push-pull).
4. The sleep mode pin shuts off all dynamic inputs, except JTAG inputs, when asserted. OPTx, INTx, M/S and the
sleep mode pins themselves (ZZx) are not affected during sleep mode.
NOVEMBER 2003
1
DSC-5670/3
©2003IntegratedDeviceTechnology,Inc.