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ST18952 Arkusz danych(PDF) 5 Page - STMicroelectronics

Numer części ST18952
Szczegółowy opis  DIGITAL SIGNAL PROCESSOR DSP CHIP
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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ST18952
2
Pin Description
The following tables detail the ST18952 pin set. There is one table for each group of pins. The
tables detail the pin name, type and a short description of the pin function.
Signal names have an overbar if they are active low, otherwise they are active high.
Table 2.1
Direct I bus extension (35 pins)
Table 2.2
Direct Y bus extension (35 pins)
Table 2.3
Direct X bus extension / bus extension through bus switch unit (39 pins)
Pin name
Type
Description
IDE0-15
I/O
Instruction data extension bus.
IAE0-15
O
Instruction address extension bus.
IRDE
O
I-extension bus read strobe. Active low.
IWRE
O
I-extension bus write strobe. Active low.
IBSE
O
I-extension bus strobe. Active low.
Pin name
Type
Description
YDE0-15
I/O
Y data extension bus.
YAE0-15
O
Y address extension bus.
YRDE
O
Y-extension bus read strobe. Active low.
YWRE
O
Y-extension bus write strobe. Active low.
YBSE
O
Y-extension bus strobe. Active low.
Pin name
Type
Description
ED_XDE0-15
I/O
Multiplexed input/output. Bus switch unit extension data bus or X data exten-
sion bus.
EA_XAE0-15
O
Multiplexed output. Bus switch unit extension address bus or X address ex-
tension bus.
EIRD
O
BSU EIRD output
EIWR
O
BSU EIWR output
XBSE
O
X extension bus data strobe
EYRD
O
BSU EYRD output
EYWR
O
BSU EYWR output
XRDE_EXRD
O
Multiplexed output.
X-extension bus read strobe (XRDE) or BSU EXRD output.
XWRE_EXWR
O
Multiplexed output.
X-extension bus write strobe (XWRE) or BSU EXWR output.


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