4

S73WS-P based MCP Products

S73WS-P_00_A0 March 16, 2006

Data

Sheet

( A dva n ce

I n f o r m a t i on)

3.2

NOR Flash and DRAM Input/Output Descriptions

Amax-A0

=

Address inputs, shared between NOR Flash and DRAM

DQ15-DQ0

=

Data input/output, shared between NOR Flash and DRAM

F-CE#

=

NOR Flash Chip-enable input. Asynchronous relative to CLK for Burst Mode.

F-OE#

=

NOR Flash Output Enable input. Asynchronous relative to CLK for Burst mode.

F-WE#

=

NOR Flash Write Enable input.

=

NOR Flash device power supply (1.7 V - 1.95V).

=

Input/Output Buffer power supply.

=Ground

RFU

=

Reserved for Future Use

F-RDY

=

Flash ready output. Indicates the status of the Burst read. VOL = data valid.

F-CLK

=

NOR Flash Clock. The first rising edge of CLK in conjunction with AVD# low latches the address input

and activates burst mode operation. After the initial word is output, subsequent rising edges of CLK

increment the internal address counter. CLK should remain low during asynchronous access.

F-AVD#

=

NOR Flash Address Valid input. Indicates to device that the valid address is present on the address

inputs.

VIL = for asynchronous mode, indicates valid address; for burst mode, causes starting address to be

latched on rising edge of CLK.

VIH= device ignores address inputs

F-RST#

=

NOR Flash hardware reset input. VIL= device resets and returns to reading array data

F-WP#

=

NOR Flash hardware write protect input. VIL = disables program and erase functions in the four

outermost sectors.

F-ACC

=

NOR Flash accelerated input. At VHH, accelerates programming; automatically places device in unlock

bypass mode. At VIL, disables all program and erase functions. Should be at VIH for all other conditions.

D-CE#

=

SDRAM Chip Select

D-CKE

=

SDRAM Clock Enable

D-BA1-BA0

=

SDRAM Bank Select

D-RAS#

=

SDRAM Row Address Strobe

D-CAS#

=

SDRAM Column Address Strobe

D-DM1-D-DM0

=

SDRAM Data Input/Output Mask

D-WE#

=

SDRAM Write Enable input

=

SDRAM Ground

=

SDRAM Input/Output Buffer ground

=

SDRAM Input/Output Buffer power supply

=

SDRAM device power supply