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T1024 데이터시트(PDF) 23 Page - Freescale Semiconductor, Inc

부품명 T1024
상세설명  QorIQ T1024 Reference Design Board
PDF  49 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
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2.12.1 Virtual banks
The virtual bank feature is available when the NOR flash is connected to IFC_CS0_N. In
that case, the value of VBANK[0:2] will be driven into three XOR gates, which toggle
the MSB's of the NOR address, as shown in the below figure.
DUT
cfg_vbank[0:2]
B_IFC
IFC_A[30:8]
IFC_A[7:5]
NOR flash
A[0:22]
A[23:25]
Figure 2-13. Virtual bank interface
When VBANK[0:2]=000, the IFC_A[7:5] is not altered, and the NOR flash behaves
normally. If VBANK[0:2]=100, the LB_A[5] is toggled and effectively swaps the top
and bottom halves of the NOR flash. If program "A" was stored in the bottom half and
program "B" in the top half then, while selecting different VBANK settings, “A” and “B”
will get their VBANKs changed as given in the below table.
Table 2-3. Virtual bank settings
NOR zones
(1/8 of 128
MB)
VBANK
000
001
010
011
100
101
110
111
A
A
B
C
D
E
F
G
H
B
B
A
D
C
F
E
H
G
C
C
D
A
B
G
H
E
F
D
D
C
B
A
H
G
F
E
E
E
F
G
H
A
B
C
D
F
F
E
H
G
B
A
D
C
G
G
H
E
F
C
D
A
B
H
H
G
F
E
D
C
B
A
NOTE
In the above table, the NOR flash has been partitioned into
eight 16 MB zones, which can be arranged under the control of
VBANK.
Chapter 2 Architecture
QorIQ T1024 Reference Design Board User Guide, Rev. 0, 04/2015
Freescale Semiconductor, Inc.
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