Infineon Technologies TC1796 User Manual

TC1796
System Units (Vol. 1 of 2)
LMB External Bus Unit
User’s Manual 13-31 V2.0, 2007-07
EBU, V2.0
Figure 13-11 Address Comparison to Detect Access to External Region
When the EBU is processing an PLMB access, the address is compared in parallel to
the parameters of all five regions. The address comparison process for one region is
shown in Figure 13-11. This process is as follows:
1. The most significant four bits of the PLMB address are compared with the ALTSEG
bit field (“alternate” segment address). The result of the comparison (1 if equal,
otherwise 0) is fed to an AND gate.
2. If ALTENAB = 0, the alternate segment function is disabled and the output of the
AND gate is 0. With ALTENAB = 1, the alternate segment function is enabled, and
the result of the comparison between ALTSEG and the segment part of the PLMB
address is fed to an OR gate.
MCA05722
31
LMB Address
282726 1211 0
Equal ?
&
15
15
Expansion
&
&
Equal ?
4
31
EBU_ADDRSELx
Register
282726 12 1047
BASE
MASK
Region
Selected
ALTSEG
811
Equal ?
ALTENAB
&
Equal ?
12
3
4
REGENAB
5
17 161514 0
6
7
31 28 27
AGEN
30
EBU_BUSCONx
Register
Burst
Mode?
8
LMB
Write ?
&
9
10
WRITE
≥1
≥1

Infineon Technologies TC1796 Specifications

General

Brand	Infineon Technologies
Model	TC1796
Category	Controller
Language	English