EP7211 Datasheet, PDF (3/166 Pages) Cirrus Logic – HIGH-PERFORMANCE ULTRA-LOW-POWER SYSTEM-ON-CHIP WITH LCD CONTROLLER

EP7211
High-Performance Ultra-Low-Power System-on-Chip with LCD Controller
OVERVIEW (cont.)
use of high-speed 32-bit operations in 16-bit op-
codes and yielding industry-leading code density.
The second is the programmable 16- or 32-bit-wide
DRAM interface that allows direct connection of up to
two banks of DRAM, each bank containing up to 256
Mbytes. To assure the lowest possible power con-
sumption, the EP7211 supports self-refresh DRAMs,
which are placed in a low-power state by the device
when it enters the low-power Standby State. EDO
and Fast Page DRAM are supported.
A DMA address generator is also provided that
fetches video display frame buffer data for the LCD
controller from main memory (typically DRAM). The
display frame buffer start address is programmable.
In addition, the built-in LCD controller can utilize
external or internal SRAM for memory, thus eliminat-
ing the need for DRAMs.
Serial Interfaces
The EP7211 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 one of the
CRYSTAL
PC CARD
SOCKET
CL-PS6700
PC CARD
CONTROLLER
×16
DRAM
×16
DRAM
×16
DRAM
×16
DRAM
×16
FLASH
×16
ROM
MOSCIN
CS[4]
PB0
EXPCLK
D[31:0]
A[27:0]
MOE
WRITE
RAS[1]
RAS[0]
CAS[0]
CAS[1]
CAS[2]
CAS[3]
CS[0]
CS[1]
DD[3:0]
CL1
CL2
FM
M
COL[7:0]
PA[7:0]
PB[7:0]
PD[7:0]
PE[2:0]
POR
PWRFL
BATOK
EXTPWR
BATCHG
RUN
WAKEUP
DRIVE[1:0]
FB[1:0]
SSICLK
SSITXFR
SSITXDA
SSIRXDA
LCD MODULE
KEYBOARD
POWER
SUPPLY UNIT
AND
COMPARATORS
DC
INPUT
BATTERY
DC-TO-DC
CONVERTERS
CODEC
×16
FLASH
×16
ROM
EXTERNAL MEMORY-
MAPPED EXPANSION
BUFFERS
ADDITIONAL I/O
BUFFERS
AND
LATCHES
CS[n]
WORD
CS[2]
CS[3]
LEDDRV
PHDIN
RXD1/2
TXD1/2
DSR
CTS
DCD
ADCCLK
ADCCS
ADCOUT
ADCIN
SMPCLK
IR LED AND
PHOTODIODE
2× RS-232
TRANSCEIVERS
ADC
DIGITIZER
Figure 1-1. A EP7211–Based System
DS352PP3
3
JUL 2001