TDMA T2290/T2297:
STUART (U1903)
B34
Description
The STUART IC(U1903) is a custom gate array that uses the following functions:
Host Port Emulation
- This provides a bus interconnection between the call processor and the DSP via the call processor’s parallel memory bus, interconnected to
the modem DSP’s parallel memory bus. This communicati ons port is functionally identical to the host port provided for the Motorola DSP; To both devices, the port
appears as a bus-mapped peripheral. The call processor sees the port as an 8-address block in memory at a location determin ed by the call processor’s programming
of its own chi p select for the START IC. The DSP sees the port as an 8-address block in I/O space. Because the STUART IC uses the high byte of the DSP’s bus,
provisions are made for byte/word conversion, to be compatible with the existin g word-wide communications with U1000(Call processor).
DSP Timer
- It provides a timer function. This is a device, accessible to the DSP, whi ch implem ent a continuously clocked timer, with rollover, a feature needed for
modem functionalit y but difficult to implem ent with the Lucent device. The Lucent timer can be set up to either stop on count=0, or to repeat the last count interval.
We need a counter that can be set up to in terrupt at a particular point in time, and then keeps counting, so that real-time is preserved, and can be set for a future time
interval. This time r has a clock that is coherent with the symbol rate.
General Purpose I/O
- It provides a 4-bit general purpose I/O port, with programming d ata direction function, as an extension to the call processor bit I/O set.
RF SPI interface
- Improved interface between the Call processor, DSP, and ZIFSYN for scanning requ irements needed because of the PCS band
Transmitter control logic
- Transmitter keying and frequency band selection.
BLOCK DIAGRAM NOT NECESSARY
REFER TO PAGE B35
Содержание T2290
Страница 1: ...DIGITAL WIRELESS TELEPHONE Service Manual Level 3 Release 1 TDMA T2290 T2297 ...
Страница 26: ... 2000 Motorola Inc TDMA T2290 T2297 Cellular Overview 16 ...
Страница 40: ...Motorola Confidential Proprietary TDMA T2290 T2297 TDMA Test Mode NAM Programming 30 ...
Страница 68: ...Disassembly TDMA T2290 T2297 Keypad Removal Motorola Confidential Proprietary 58 ...