TC9446FG Datasheet, PDF (26/41 Pages) Toshiba Semiconductor – Audio Digital Processor for Decode of Dolby Digital (AC-3), MPEG2 Audio

TC9446FG
10. External SRAM Connection
It can be used by the ability of able to connect external SRAM to processing of data tables, such as
coefficient data, or data delay.
The function of the terminal for external SRAM control is shown in Table 7. Moreover, the example of
connection of external SRAM is shown in Figure 21.
Table 7 Function of Terminal for External SRAM Control
Terminal Name
Functions
WR terminal
Write signal output terminal for external SRAM
OE terminal
Output enable signal output terminal for external SRAM
CE terminal
Chip enable signal output terminal for external SRAM
IO0 to IO7 terminal
Data input/output terminal for external SRAM (8 bit I/O)
It is 3^rd times accessing at 24 bit I/O.
Address output terminal for external SRAM
AD0 to AD16 terminal
It can access to address 00000h to 20000h.
Example of High-speed 1 M SRAM connection
TC9446FG (3.3
17
AD0¯AD16
8
IO0¯IO7
CE
OE
WR
1 M HS SRAM (3.3 V)
AD0¯AD16
IO0¯IO7
CE
OE
WR
Example of High-speed 256 k SRAM connection
TC9446FG (3.3
AD15, 16
AD0¯AD14
N.C
15
256 k HS SRAM (3.3 V)
AD0¯AD14
8
IO0¯IO7
IO0¯IO7
CE
CE
OE
OE
WR
WR
Figure 21 Example of Connection of External SRAM
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2005-09-28