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PDF PXA272 Data sheet ( Hoja de datos )
| Número de pieza | PXA272 | |
| Descripción | Interfacing Dual Port to Intel Embedded Processor | |
| Fabricantes | Cypress | |
| Logotipo |  |
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Interfacing Cypress MoBL® Dual-Port to Intel® PXA272
Embedded Processor
Introduction
Table 1. PXA272 & CYDM256A16 Signal Equivalents
The PXA272 Embedded Processor of the Intel® PCA
(continued)
processor family is an integrated system-on-a-chip micropro-
cessor for high performance, dynamic and low-power
portable handheld and handset devices.
The Intel PXA272 processor includes a memory interface that
gives designers more flexibility as it supports a variety of
external memory types.
CYDM256A16 is an asynchronous MoBL® Dual-Port memory
PXA272 Signal CYDM256A16
(I/O)
Signal (I/O)
External I ODR[4:0] O
Devices
External O IRR[1:0] I
Devices
Function
Output Drive Register
Input Read Register
from Cypress Semiconductor. It has a 256-Kbit shared
M/S I
Master/Slave
memory array with two 16-bit data buses. The shared
Select: pulled up to VCC
memory structure allows independent access from both ports
to 32K address locations. The device is available in -35 and
Layout Guidelines
-55 speed grades in both commercial and industrial temper-
ature ranges. Internal arbitration logic is also available to
Figure 1 below shows the physical wiring between the
decide which port gets access when both ports try to access
PXA272 processor and the MoBL Dual-Port CYDM256A16.
the same memory location at the same time.
Either port of the MoBL Dual-Port may be used. Table 2
shows the list of unused PXA272 EMI pins.
The MoBL Dual-Port can act as an interconnect between two
processing elements that share data while operating at
www.DataSheet4U.comdifferent speeds. This application note describes how to
DQ[15:0]
MD[15:0]
interface the CYDM256A16 to the Intel PXA272.
A[14:0]
MA[14:0]
CE CSx
External Memory Interface (EMI)
The Intel PXA272’s External Memory Interface is a 16/32-bit
OE OE
R/W WE
UB DQM[1]
interface and it can be configured to gluelessly interface to
LB DQM[0]
Cypress low-power MoBL Dual-Ports.
INT GPIO
The Cypress MoBL Dual-Port CYDM256A16 has a standard
asynchronous SRAM interface. Table 1 lists the signal
connections between Intel PXA272 and Cypress MoBL
Dual-Port CYDM256A16.
Table 1. PXA272 & CYDM256A16 Signal Equivalents
BUSY
SFEN
M/S
IRR
ODR
Cypress MoBL Dual-Port
CYDM256A16
RDY
Vcc GPIO
Ext. Inputs
Ext. Outputs
Intel Embedded Processor
PXA272
PXA272 Signal CYDM256A16
(I/O)
Signal (I/O)
Function
Figure 1. Wiring Diagram of PXA272 to CYDM256A16
CSx
WE
OE
MA[14:0]
O
O
O
O
CE
R/W
OE
A[14:0]
I
I
I
I
Chip select
Write enable
Output enable
Address
Table 2. Unused Intel PXA272 Signals
MA[25:15]
CLK
NC
NC
MD[15:0] I/O DQ[15:0] I/O
DQM[1] O UB I
DQM[0] O LB I
RDY
I BUSY I/O
GPIOx I
INT O
Data
Upper byte enable
Lower byte enable
Busy Signal
Mailbox Interrupt
Voltage Compatibility
Cypress MoBL Dual-Ports have operating voltages of 1.8V,
2.5V, and 3.0V, while the Intel PXA272 supports 1.8V, 2.5V
and 3.3V I/O supply voltages. Thus, the Cypress MoBL
Dual-Ports are compatible with the Intel processor PXA272
when both devices operate at the same voltage.
GPIOx O SFEN I Special Function enable
Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600
Revised March 31, 2005
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