EP7312-CB-90 CIRRUS [Cirrus Logic], EP7312-CB-90 Datasheet - Page 7

• Manufacturer Part Number: EP7312-CB-90
• Description: HIGH-PERFORMANCE, LOW-POWER SYSTEM ON CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE
• Manufacturer: CIRRUS [Cirrus Logic]

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
supports self-refresh SDRAMs, which are placed in a
low-power state by the device when it enters the low-
power Standby State.
Interface pin assignments.
Digital Audio Capability
The EP7312 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 EP7312
Universal Asynchronous
Receiver/Transmitters (UARTs)
The EP7312 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 UART 1 to enable these signals
DS508PP5
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:
Pin Mnemonic
possible
1. Pins A[27:13] map to DRA[0:14] respectively.
balance the load for large memory systems.
2. Pins are multiplexed. See
Table 3. SDRAM Interface Pin Assignments
(i.e. A[27}/DRA[0}, A[26}/DRA[1], etc.) This is to
more information.
(Note 2)
(Note 2)
(Note 1)
(Note 2)
(Note 2)
power
Table 3
I/O
I/O
I/O
consumption, the
O
O
O
O
O
O
O
O
O
Table 19 on page 11
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
shows the SDRAM
Pin Description
©
C opyright Cirrus Logic, Inc. 2003
(All Rights Reserved)
EP7312
for
to drive an infrared communication interface directly.
Table 4
Digital Audio Interface (DAI)
The EP7312 integrates an interface to enable a direct
connection to many low cost, low power, high quality
audio converters. In particular, the DAI can directly
interface with the Crystal
audio DACs and the Crystal
Some of these devices feature digital bass and treble
boost, digital volume control and compressor-limiter
functions.
assignments.
TXD[1]
RXD[1]
CTS
DCD
DSR
TXD[2]
RXD[2]
LEDDRV
PHDIN
SCLK
SDOUT
SDIN
LRCK
MCLKIN
MCLKOUT
Table 4. Universal Asynchronous Receiver/Transmitters Pin
Note:
Pin Mnemonic
Pin Mnemonic
shows the UART pin assignments.
See
multiplexes.
High-Performance, Low-Power System on Chip
Table 5. DAI Interface Pin Assignments
Table 5
Table 18 on page 11
shows the DAI Interface pin
Assignments
I/O
O
O
O
I
I
I
I
I
I
‚
I/O
O
O
O
O
CS43L41/42/43 low-power
‚
I
I
CS53L32 low-power ADC.
for information on pin
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
Serial bit clock
Serial data out
Serial data in
Sample clock
Master clock input
Master clock output
Pin Description
Pin Description
EP7312
7