PC28F512G18FF Datasheet, PDF (28/118 Pages) Micron Technology – 128Mb, 256Mb, 512Mb, 1Gb StrataFlash Memory

128Mb, 256Mb, 512Mb, 1Gb StrataFlash Memory
Extended Configuration Register
Extended Configuration Register
The extended configuration register is a volatile 16-bit, read/write register used to select
deep-power down and output-driver strength of the device.
Upon power-up or exit from reset, the extended configuration register defaults to
0004h.
The extended configuration register is programmed using the PROGRAM EXTENDED
CONFIGURATION REGISTER command. To read the extended configuration register,
issue the READ ID command to a partition, and read from <partition base address> +
06h.
Table 13: Extended Configuration Register Bit Definitions (Default Value = 0004h)
Bit
Name
15:3
Reserved
2:0
Output driver control
Description
Write 0 to reserved bits
0 0 1 = Code 1
0 1 0 = Code 2
0 1 1 = Code 3
1 0 0 = Code 4 (default)
1 0 1 = Code 5
1 1 0 = Code 6
Other bit settings are reserved
Output Driver Control
The output driver control bits of the extended configuration register enable adjustment
of the device’s output-driver strength for DQ[15:0] and WAIT. Upon power-up or reset,
ECR[2:0] defaults to 100b for to an output impedance setting of 30 Ohms. To change the
output-driver strength, program ECR[2:0] to the desired setting.
Table 14: Output Driver Control Characteristics
ECR[2:0]
001
010
011
100
101
110
Driver Impedance
(at V_CCQ/2)
90 Ohms
60 Ohms
45 Ohms
30 Ohms
20 Ohms
15 Ohms
Driver Multiplier
1/3
1/2
2/3
1
1–1/2
2
Load (Same Speed)
10pF
15pF
20pF
30pF
35pF
40pF
PDF: 09005aef8448483a
128_256_512_65nm_g18.pdf - Rev. F 8/11 EN
28
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