EP7311_05 Datasheet, PDF (10/58 Pages) Cirrus Logic – High-performance, Low-power, System-on-chip with SDRAM & Enhanced Digital Audio Interface

EP7311
High-Performance, Low-Power System on Chip
DC-to-DC converter interface (PWM)
• Provides two 96 kHz clock outputs with programmable
duty ratio (from 1-in-16 to 15-in-16) that can be used to
drive a positive or negative DC to DC converter
Pin Mnemonic
I/O
Pin Description
DRIVE[1:0]
FB[1:0]
I/O PWM drive output
I
PWM feedback input
Table N. DC-to-DC Converter Interface Pin Assignments
Timers
• Internal (RTC) timer
• Two internal 16-bit programmable hardware count-down
timers
General Purpose Input/Output (GPIO)
• Three 8-bit and one 3-bit GPIO ports
• Supports scanning keyboard matrix
Pin Mnemonic
I/O
Pin Description
PA[7:0]
I/O GPIO port A
PB[7:0]
I/O GPIO port B
PD[0]/LEDFLSH
(Note) I/O GPIO port D
PD[5:1]
I/O GPIO port D
PD[7:6]/SDQM[1:0] (Note) I/O GPIO port D
PE[1:0]/BOOTSEL[1:0] (Note) I/O GPIO port E
PE[2]/CLKSEL
(Note) I/O GPIO port E
Table O. General Purpose Input/Output Pin Assignments
Note: Pins are multiplexed. See Table S on page 11 for more
information.
Hardware debug Interface
• Full JTAG boundary scan and Embedded ICE^® support
Pin Mnemonic
I/O
Pin Description
TCLK
TDI
TDO
nTRST
TMS
I
JTAG clock
I
JTAG data input
O
JTAG data output
I
JTAG async reset input
I
JTAG mode select
Table P. Hardware Debug Interface Pin Assignments
LED Flasher
A dedicated LED flasher module can be used to generate a low
frequency signal on Port D pin 0 for the purpose of blinking an
LED without CPU intervention. The LED flasher feature is
ideal as a visual annunciator in battery powered applications,
such as a voice mail indicator on a portable phone or an
appointment reminder on a PDA.
• Software adjustable flash period and duty cycle
• Operates from 32 kHz RTC clock
• Will continue to flash in IDLE and STANDBY states
• 4 mA drive current
Pin Mnemonic
I/O
Pin Description
PD[0]/LEDFLSH
(Note) O LED flasher driver
Table Q. LED Flasher Pin Assignments
Note: Pins are multiplexed. See Table S on page 11 for more
information.
Internal Boot ROM
The internal 128 byte Boot ROM facilitates download of saved
code to the on-board SRAM/FLASH.
Packaging
The EP7311 is available in a 208-pin LQFP package, 256-ball
PBGA package or a 204-ball TFBGA package.
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©Copyright Cirrus Logic, Inc. 2005
(All Rights Reserved)
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