R
2047
D a t a [7:0]
F0 - FF
E0 - EF
D0 - DF
Hardware Schematic Diagram
C0 - CF
B0 - BF
A0 - AF
The RAM a rr a y i s divided in
p a ge s of eight b yte s b y 16,
forming a n a rr a y of 128 b yte s .
Thi s a rr a y repre s ent s one
col u mn of s t a nd a rd A S CII t ab le.
1280
Not U s ed
A ch a r a cter i s s tored as :
Addr[10:0]
1279
Not U s ed
1024
1023
70 - 7F
60 - 6F
50 - 5F
40 - 4F
N-x
N
30 - 3F
N-1
S hift
Direction
256
255
20 - 2F
10 - 1F
Addr
RAMB16_ S 9
0
Not U s ed
0
0 1 2 3 4 5 6 7 D a t a
UG199_C_10_050106
Figure C-10:
Block RAM Organization
When presenting byte value 30 hex, character 0 must be displayed. Shifting the value
00110000b (30h) up three positions gives the value 180h or 348d.
Because each character uses eight byte locations, character 0 in the character set starts from
memory location 348 decimal.
For example, character X has byte value 58h or 01011000b. Shifting this value three
positions gives the value 2C0h or 704d.
Virtex-5 FPGA ML561 User Guide
UG199 (v1.2.1) June 15, 2009
137
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