The TMS320C5416
will detect the change in the memory location 0x007F and branch to the indicated value
in that memory location and start program execution. The HPI boot is now complete and
the DSP will run normally.
The picture in Figure 5.4 shows the interconnection between the DSP??™s HPI and the
ColdFire GP processor. As can be seen from the ?¬?gure, the HPI is used in 8 bit mode and is
connected to the upper 8 bit of the data bus. Address lines A[1??“4] are used to control the
HPI registers.
An 8 bit data bus exchanges information between the host and the target. Due to the
16 bit work structure of C5416, all data transfers with a host must consist of two consecutive
bytes. The dedicated HBIL pin indicates whether the ?¬?rst or second byte is transferred.
HPIENA
D[7??“15]
A[1]
A[2]
A[3]
A[4]
CLKOUT
CSB1\
INT2
GND
D[0??“7]
GND
HINT
HCS\
HRDY
HPIL
HCNTL0
HCNTL1
R/W
TMS320VC5416 MC5407C3
Vcc
HPI16 GND
TP [23??“30]
TP 32
TP 36
TP 37
TP 35
TP 38
TP 31
TP 33
FIGURE 5.4
HPI connection.
Contemporary RFID Reader Architecture 101
The HCNTL0=1 control inputs indicate which one of the three internal HPI registers is
accessed, as well as the type of access. In the proposed con?¬?guration the host address bus
is used to drive these two control inputs along with HBIL and R=W signal.
The host can specify access to the HPIC, the HPIA, or HPID register.
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