S71PL129JC0 datasheet(19/149 Pages) SPANSION

19 / 149 page

June 4, 2004 S29PL129J_MCP_00_A0

S29PL129J for MCP

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Informatio n

Device Bus Operations

This section describes the requirements and use of the device bus operations,

which are initiated through the internal command register. The command register

itself does not occupy any addressable memory location. The register is a latch

used to store the commands, along with the address and data information

needed to execute the command. The contents of the register serve as inputs to

the internal state machine. The state machine outputs dictate the function of the

device. Table 1 lists the device bus operations, the inputs and control levels re-

quired, and the resulting output. The following subsections describe each of these

operations in further detail.

Legend: L = Logic Low = VIL, H = Logic High = VIH, VID = 11.5–12.5 V, VHH = 8.5–9.5 V, X = Don’t Care, SA = Sector

Address, AIN = Address In, DIN = Data In, DOUT = Data Out

Notes:

1. The sector protect and sector unprotect functions may also be implemented via programming equipment. See

““High Voltage Sector Protection” on page 37.”

2. WP#/ACC must be high when writing to upper two and lower two sectors.

Requirements for Reading Array Data

To read array data from the outputs, the system must drive the OE# and appro-

priate CE# pins to VIL. In PL129J, CE1# and CE2# are the power control and

select the lower (CE1#) or upper (CE2#) halves of the device. CE# is the power

control. OE# is the output control and gates array data to the output pins. WE#

should remain at VIH.

The internal state machine is set for reading array data upon device power-up,

or after a hardware reset. This ensures that no spurious alteration of the memory

content occurs during the power transition. No command is necessary in this

mode to obtain array data. Standard microprocessor read cycles that assert valid

addresses on the device address inputs produce valid data on the device data

outputs. Each bank remains enabled for read access until the command register

contents are altered.

See Table 24 for timing specifications and Figure 11 for the timing diagram. ICC1

in the DC Characteristics table represents the active current specification for

reading array data.

Table 1. PL129J Device Bus Operations

Operation

CE1#

CE2#

OE#

WE#

RESET#

WP#/ACC

Addresses

(A21–A0)

DQ15–

DQ0

Read

AIN

DOUT

Write

(Note 2)

AIN

DIN

Standby

VIO±

0.3 V

VIO ±

0.3 V

VIO ±

0.3 V

High-Z

Output Disable

High-Z

Reset

High-Z

Temporary Sector Unprotect

(High Voltage)

VID

AIN

DIN

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