BenQ
Rev 1.0
3.1.7 Serial
Port Interface (SPI)
The SPI is a full-duplex serial port configurable from 1 to 32 bits and
provides 3 enable signals programmable either as positive or
negative edge or level sensitive. This interface is working on
13MHz and is used for the GSM baseband and voice A/D, D/A with
Omega.
3.1.8 Memory
Interface
and internal Static RAM
For external memory device (Flash), this interface performs read
and write access with adaptation to the memory width. It also
provides 4 chip-select signals corresponding each to an address
range of 16 mega bits. One of these chip-select is dedicated to the
selection of an internal memory. In 56f16, we employ NCS0
(NROMCS1) for external Flash.
The access cycle is guaranteed with 1 wait-state for any cycle
frequency up to 13MHz.
3.1.9 SIM
Interface
The Subscriber Identity Module interface will be fully compliant with
the GSM 11.11 and ISO/IEC 7816-3 standards. Its external interface
is 3 Volts only. 5 Volts adaptation will be based on external level
shifters. In 56f16, the 5V level shifter is embedded in Nausica.
3.1.10 JTAG
In 56f16, JTAG is used for first download and software debugging.
3.1.11 Time Serial Port (TSP)
The TPU is a real-time sequencer dedicated to the monitoring of
GSM baseband processing. The TSP is a peripheral of the TPU
which includes both a serial port (32 bits) and a parallel interface.
The serial port can be programmed by the TPU with a time accuracy
of the quarter of GSM bit. The serial port is uni-directional (transmit
only) when used with NAUSICA. The serial port provides 4 enable
signals programmable either as positive or negative edge or level
sensitive. This serial port is derived from 6.5MHz and used to
control the real time GSM windows for the baseband codec and the
windows for ADC conversion.
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