EP7311
High-Performance, Low-Power System on Chip
The second is the programmable 16- or 32-bit-wide SDRAM
interface that allows direct connection of up to two banks of
SDRAM, totaling 512 Mb. To assure the lowest possible power
consumption, the EP7311 supports self-refresh SDRAMs,
which are placed in a low-power state by the device when it
enters the low-power Standby State.
Pin Mnemonic
SDCLK
SDCKE
nSDCS[1:0]
WRITE/nSDRAS
nMOE/nSDCAS
nMWE/nSDWE
A[27:15]/DRA[0:12]
A[14:13]/DRA[12:14]
PD[7:6]/SDQM[1:0]
SDQM[3:2]
D[31:0]
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 1)
UART 1 to enable these signals to drive an infrared
communication interface directly.
Pin Mnemonic
TXD[1]
RXD[1]
I/O
O
I
I
I
I
O
I
O
I
Pin Description
UART 1 transmit
UART 1 receive
UART 1 clear to send
UART 1 data carrier detect
UART 1 data set ready
UART 2 transmit
UART 2 receive
Infrared LED drive output
Photo diode input
I/O
O
O
O
O
O
O
O
O
I/O
O
I/O
Pin Description
SDRAM clock output
SDRAM clock enable output
SDRAM chip select out
SDRAM RAS signal output
SDRAM CAS control signal
SDRAM write enable control
signal
SDRAM address
SDRAM internal bank select
SDRAM byte lane mask
SDRAM byte lane mask
Data I/O
CTS
DCD
DSR
TXD[2]
RXD[2]
LEDDRV
PHDIN
Table D. Universal Asynchronous Receiver/Transmitters Pin
Assignments
Multimedia Codec Port (MCP)
The Multimedia Codec Port provides access to an audio codec,
a telecom codec, a touchscreen interface, four general purpose
analog-to-digital converter inputs, and ten programmable
digital I/O lines.
Pin Mnemonic
SIBCLK
SIBDOUT
SIBDIN
Table C. SDRAM Interface Pin Assignments
Note:
1. Pins A[27:13] map to DRA[0:14] respectively.
(i.e. A[27}/DRA[0}, A[26}/DRA[1], etc.) This is to
balance the load for large memory systems.
2. Pins are multiplexed. See
for
more information.
I/O
O
O
I
O
Pin Description
Serial bit clock
Serial data out
Serial data in
Sample clock
Digital Audio Capability
The EP7311 uses its powerful 32-bit RISC processing engine
to implement audio decompression algorithms in software. The
nature of the on-board RISC processor, and the availability of
efficient C-compilers and other software development tools,
ensures that a wide range of audio decompression algorithms
can easily be ported to and run on the EP7311
SIBSYNC
Table E. MCP Interface Pin Assignments
Note:
See
for information on pin
multiplexes.
Universal Asynchronous
Receiver/Transmitters (UARTs)
The EP7311 includes two 16550-type UARTs for RS-232
serial communications, both of which have two 16-byte FIFOs
for receiving and transmitting data. The UARTs support bit
rates up to 115.2 kbps. An IrDA SIR protocol encoder/decoder
can be optionally switched into the RX/TX signals to/from
DS506F1
©
Copyright Cirrus Logic, Inc. 2005
(All Rights Reserved)
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