IS43R32400A-6B ISSI, Integrated Silicon Solution Inc, IS43R32400A-6B Datasheet - Page 16

• Manufacturer Part Number: IS43R32400A-6B
• Manufacturer: ISSI, Integrated Silicon Solution Inc
• Type: DDR SDRAMr

Specifications of IS43R32400A-6B

• Organization: 4Mx32
• Density: 128Mb
• Address Bus: 14b
• Access Time (max): 850ps
• Maximum Clock Rate: 166MHz
• Operating Supply Voltage (typ): 2.5V
• Package Type: FBGA
• Operating Temp Range: 0C to 70C
• Operating Supply Voltage (max): 2.625V
• Operating Supply Voltage (min): 2.375V
• Supply Current: 420mA
• Pin Count: 144
• Mounting: Surface Mount
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Not Compliant

IS43R32400A
EXTENDED MODE REGISTER DEFINITION
The Extended Mode Register is a second register to
enable additional functions of the DDR SDRAM. This
register is loaded as a step in the normal initialization
of the device. The Load Extended Mode Register
command samples the values on inputs A0-A11, BA0
(High) and BA1 (Low) and stores them as register
values E0-E13. The additional functions are DLL
enable/disable and output drive strength. Similarly to
the Load Mode Register, the Load Extended Mode
Register has reserved bit values, a bank idle pre-
requisite, and a tMRD time requirement. The data in
the mode register is retained until it is reloaded or the
device loses its power.
EXTENDED MODE REGISTER DEFINITION
16
Operating Mode
E13
—
0
BA1 BA0 A11 A10
E12
—
1
E11
—
0
E10
—
0
E9
—
0
A9
E8
—
0
Drive Strength
A8
E6
—
0
0
1
E7
—
0
A7
E5
—
0
0
0
Mode
Standard Operation
All Other States Reserved
A6
E4
—
0
0
0
A5
DLL Enable/Disable
When the Load Extended Mode Register command is
issued, DLL should be enabled (E0 = 0). Normal
operation of the device requires this, but DLL can be
disabled for debugging or evaluation, if necessary.
Output Drive Strength
Normal drive strength for the outputs is specified as
SSTL 2. However, there are options for reduced drive
strength included.
E3
—
0
0
0
A4
Integrated Silicon Solution, Inc. — 1-800-379-4774
E2
—
A3
0
0
0
A2
E1
—
0
1
1
A1
Type
Full Strength
Weak-60%
Matched Impedence
All Other States Reserved
DLL
A0
E0
0
1
Address Bus (Ax)
Mode Register (Ex)
Status
Enable
Disable
ISSI
Rev. 00D
02/15/06
®