peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 119

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

2.7.7
If the user writes by mistake to the program RAM, the DSP program may collapse.
A protection is provided by means of a password which the user must write to the
password register (PASSR) before writing into the program RAM. PASSR must be
written with the value F236
different from F236
MOVD instruction.
Memory mapped address C006
16-bit read/write register
bit
PASSR
Reset value - 0000
Note: The boot routine automatically sets the value of PASSR to F236
2.7.8
This register determines the emulation configuration.
Memory mapped address C007
2-bit read/1 bit write register
bit
JCONF
Reset value - 8000
ABORTI
ACTIVE
Semiconductor Group
download of data to the program RAM. After the download, the boot routine writes
0000
bypassed during trap/bi handler in order to enable the monitor to change the
program.
H
Program Write Protection Register (PASSR)
Serial (via JTAG) Emulation Configuration Register (JCONF)
This bit is read/write. When set to ‘1’ the abort is as in “parallel emulation”
(i.e. via ABORT pin). When resets to ‘0’ the abort function is implemented
via TDI pin (see SEIB chapter for more details).
This bit is read only, it gets the inverted value of bit 12 of c-bus
(CDB12/SEIBDIS) at the rising edge of DRESET, when it used as a strap.
When ‘1’ it means that SEIB is active (i.e. emulation is serial via JTAG).
When ‘0’ SEIB is not active, i.e.emulation is parallel.
15
15
ABORTI ACTIVE
to PASSR for enabling the program protection. This mechanism is
H
H
H
, the CDPW (external program RAM write) is not issued during a
(except bit 14 which is determined by strap)
14
H
for enabling a program write. If the value in PASSR is
H
H
.
.
13
2-73
Functional Block Description
H
for enabling the
PEB 20560
0
0
2003-08