Intel PXA26X User Manual

2-11

nCS[5]/

GPIO[33]

ICOCZ

STATIC CHIP SELECTS (output):

Chip selects to static memory devices such as ROM and 
flash. Individually programmable in the memory 
configuration registers. nCS[5:0] can be used with variable 
latency I/O devices. 

Pulled High 
Note [1]

Note [4]

nCS[4]/

GPIO[80]

ICOCZ

nCS[3]/

GPIO[79]

ICOCZ

nCS[2]/

GPIO[78]

ICOCZ

nCS[1]/

GPIO[15]

ICOCZ

nCS[0]

ICOCZ

STATIC CHIP SELECT 0 (output):

Chip select for the boot memory. nCS[0] is a dedicated pin 
used for internal flash.

Driven High

Note [4]

RD/nWR/
GPIO[88]

OCZ

READ/WRITE FOR STATIC INTERFACE (output):

Signals that the current transaction is a read or write.

Driven Low 
(but see Note[8])

Driven High (but 
see Note[8])

RDY/

GPIO[18]

ICOCZ

VARIABLE LATENCY I/O READY PIN (input):

Notifies the memory controller when an external bus 
device is ready to transfer data.

Pulled High
Note [1]

Note [3]

L_DD[8]/

GPIO[66]

ICOCZ

LCD DISPLAY DATA (output):

Transfers pixel information from the LCD Controller to the 
external LCD panel.

Memory Controller alternate bus master request. (input) 
Allows an external device to request the system bus from 
the Memory Controller.

Pulled High
Note [1]

Note [3]

L_DD[15]/

GPIO[73]

ICOCZ

LCD DISPLAY DATA (output):

Transfers pixel information from the LCD Controller to the 
external LCD panel.

Memory Controller grant. (output) Notifies an external 
device that it has been granted the system bus.

Pulled High
Note [1]

Note [3]

MBGNT/GP[13] ICOCZ

MEMORY CONTROLLER GRANT (output):

Notifies an external device that it has been granted the 
system bus.

Pulled High
Note [1]

Note [3]

MBREQ/GP[14] ICOCZ

MEMORY CONTROLLER ALTERNATE BUS MASTER 
REQUEST (input):

Allows an external device to request the system bus from 
the Memory Controller.

Pulled High
Note [1]

Note [3]

PCMCIA/CF Control Pins

nPOE/

GPIO[48]

ICOCZ

PCMCIA OUTPUT ENABLE (output):

Reads from PCMCIA memory and to PCMCIA attribute 
space.

Pulled High
Note [1]

Note [5]

nPWE/

GPIO[49]

ICOCZ

PCMCIA WRITE ENABLE (output):

Performs writes to PCMCIA memory and to PCMCIA 
attribute space. Also used as the write enable signal for 
Variable Latency I/O.

Pulled High
Note [1]

Note [5]

nPIOW/

GPIO[51]

ICOCZ

PCMCIA I/O WRITE (output):

Performs write transactions to PCMCIA I/O space. 

Pulled High
Note [1]

Note [5]