5-16 5100 ES Series Portable Radio Service Manual
Circuit Description
5.4.5 HPI Bus Multiplexer
The MPC870 processor communicates with the 5510 DSP on the Logic Board via the DSP
16 bit host peripheral (HPI) bus. This interface is used by the MPC870 to load application
code into the DSP internal SRAM and for exchanging control/status with the DSP.
Due to pin limitations on the 60 connector (J2) between the UI and Logic board, the HPI
bus is multiplexed across J2 in two 8 bit transfers. The bus transfer is controlled by logic in
the CPLD at U5. The signals controlling the transfer (DSP_DS0, DSP_DS1, EB_CS5, and
EB_R/nW – J2 pins 39, 50, 12 and 13) are generated by the MPC870. Operation of the
multiplexer logic is shown in the table below.
Table 5.1 Multiplexer Logic Operation
5.4.6 Bus Configuration Logic
At reset (signal nHRESET low), the CPLD at U5 sets the initial operating configuration of
the MPC870 by driving selected signals on the MPC870 data bus (signals EB_D0-15)
high. Two different configurations can be selected depending on the state of the nTAP
(test point TP56) signal line to the CPLD. If nTAP is left floating (normal configuration),
the MPC870 JTAG/BDM port is set for BDM operation. If nTAP is pulled low, the
MPC870 JTAG/BDM port is set for JTAG operation.
5.4.7 HC08 Microcontroller
A Freescale MC9S08GT60 microcontroller (U39) is used to handle general purpose
analog to digital conversion, keypad/switch scanning and decoding, and keyload serial
communication. A communication channel to the control processor is maintained through
the SPI bus.
5.4.8 SPI Flash
The SPI Flash (U40 or U44) is a 512Kbit Flash memory device used to store radio
operating parameters. Only one device is present on the board. The device is accessed by
the MPC870 via the UI Board SPI bus.
EB_CS5
EB_R/nW
DSP_DS0
DSP_DS1
8 bit bus J2
1
x
x
x
Hi Z
0
1
0
1
DSP lsb
0
1
1
0
DSP msb
0
0
0
1
PPC lsb
0
0
1
0
PPC msb
Содержание 5100 ES
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Страница 74: ...7 4 5100 ES Series Portable Radio Service Manual January 2007 Troubleshooting ...
Страница 125: ...January 2007 5100 ES Series Portable Radio Service Manual 9 47 Parts List Figure 9 4 Front Housing Assembly Model III ...
Страница 126: ...January 2007 5100 ES Series Portable Radio Service Manual 9 48 Parts List Figure 9 5 Front Housing Assembly Model II ...
Страница 127: ...January 2007 5100 ES Series Portable Radio Service Manual 9 49 Parts List Figure 9 6 Front Housing Assembly Model I ...
Страница 132: ...January 2007 5100 ES Series Portable Radio Service Manual 9 54 Parts List Figure 9 11 Front Cover Assembly Model II III ...
Страница 133: ...January 2007 5100 ES Series Portable Radio Service Manual 9 55 Parts List Figure 9 12 Front Cover Assembly Model I ...
Страница 134: ...January 2007 5100 ES Series Portable Radio Service Manual 9 56 Parts List Figure 9 13 Front Cover Assembly Detail ...
Страница 180: ...10 46 5100 ES Series Portable Radio Service Manual January 2007 Schematic Diagrams and Component Layouts ...