peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 36

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

Semiconductor Group
Table 1-4 DSP External Memory Interface
Pin
No.
153 CDPR
154 CDPW
155 CMBR
156 CMBW
159 CBR
123
122
121
120
117
116
115
114
111
110
109
108
104
103
102
101
128 CDB0/
129 CDB1/
130 CDB2/
Symbol
CAB15
CAB14
CAB13
CAB12
CAB11
CAB10
CAB9
CAB8
CAB7
CAB6
CAB5
CAB4
CAB3
CAB2
CAB1
CAB0
BOOT
DBG
ROM
In (I)
Out (O)
O
O
O
O
O
O
I/O
I
I/O
I
I/O
I
During
Reset
“High”
“High”
“High”
“High”
“High”
I
I
I
Function
C-Bus Data or Program Read (active low)
C-Bus Data or Program Write (active low)
C-Bus Mail-Box Boot Read (active low)
C-Bus Mail-Box Boot Write (active low)
C-Bus Boot Read (active low)
C-Bus Address Bus (CAB0 = lsb)
C-Bus Data Bus bit 0 (lsb),
During reset this pin is used as a strap, called
Boot. It enables the OAK to execute the boot
routine from internal boot ROM.This routine loads
a DSP program into the external program RAM.
Refer to section 2.7.9
C-Bus Data Bus bit 1,
DBG(debug): During reset this pin is used as a
strap. It may prevents reset of OCEM registers
when a reset is initiated by the debugger
Refer to section 2.7.9
C-Bus Data Bus bit 4
ROM: During reset this pin is used as a strap. It
enables boot from the CDI ROM.
Refer to section 2.7.9
1-16
PEB 20560
Overview
2003-08