pxb4219 Infineon Technologies Corporation, pxb4219 Datasheet - Page 120

• Manufacturer Part Number: pxb4219
• Description: Iwe8 Interworking Element For 8 E1/t1 Lines
• Manufacturer: Infineon Technologies Corporation

6
The IWE8 occupies an address space of 256k x 16 bits. The lower 128k x 16 bits are
used for internal registers and internal configuration RAM’s. The upper 128k x 16 bits are
used to address external RAM.
MPADR[17:0]
3FFFF
20000
1FFFF
00A00
009FF
00800
007FF
00600
005FF
00400
003FF
00200
001FF
00000
Figure 36
The 4 internal configuration RAMs are organized as 256 x 32 bit memories.
The external RAM is organized as a 64k x 32 bit parity protected memory.
Accesses to internal configuration RAM’s or external RAM are always 32 bit oriented.
Data Sheet
H
H
H
H
H
H
H
H
H
H
H
H
H
H
Memory Structure
Memory Model
128k × 16
512 × 16
512 × 16
512 × 16
512 × 16
512 × 16
Internal Registers
Internal RAM4
Internal RAM3
Internal RAM2
Internal RAM1
External RAM
Not used
64k × 32
256 × 32
256 × 32
256 × 32
256 × 32
120
PXB4219 / PXB4220 / PXB4221
RMADR[15:0]
FFFF
0000
H
H
Memory Structure
2002-05-06