MB86941 Datasheet, PDF (14/49 Pages) Fujitsu Component Limited. – Peripheral LSI for SPARClite

MB86941/942
5. RCSTG SIGNALS (11)
Pin symbol I/O Pin no.
Pin name
Description
CS0#
CS1#
CS2#
CS3#
O 16 Expansion Chip Select 0
Expansion Chip Select output pin
O
21 Expansion Chip Select 1 _{When the input to the RCS# pin is “L,” one of these}
O
24 Expansion Chip Select 2 ^{chip select signals will be active depending on the}
combination of input signals to the A0, A1 pins.
O 25 Expansion Chip Select 3
Expansion Read Enable output pin
When the input to the RCS# pin is “L” and a bus cycle
RE#
O 35 Expansion Read Enable begins with an “H” input to the RD/WR# pin, this pin
produces a pulse of the designated width and the
designated timing.
WE#
Expansion Write Enable output pin
When the input to the RCS# pin is “L” and a bus cycle
O 36 Expansion Write Enable begins with an “L” input to the RD/WR# pin, this pin
produces a pulse of the designated width and the
designated timing.
Expansion Data Strobe output pin
DS#
O
47
Expansion Data Strobe
When a bus cycle begins with the RCS# pin input at
“L” level, this pin produces a pulse of the designated
width and the designated timing.
RCS#
Resource Chip Select pin.
This pin is used to input the chip select signal supplied
to the module RCSTG.
When the module RCSTG is used to generate the
I
37 Resource Chip Select external resource chip select signals CS0# to CS3#,
read strobe RE#, write strobe WE#, and data strobe
DS#, the corresponding areas must be decoded.
This pin has internal pull-up resistance (MB86941
only).
A0
I
38 Address 0
A1
I
39 Address 1
These are the input pins for the address signal to the
module RCSTG.
When the module RCSTG is used to generate the
external resource chip select signals CS0# to CS3#,
read strobe signal RE#, write strobe signal WE#, and
data strobe signal DS#, this address input signal is
used to designate the byte position in the
corresponding area.
When the input to the RCS# pins is “L”’ level, the input
signal to these pins determines which of the external
resource chip select signals CS0# to CS3# goes
active.
These pins have internal pull-up resistance (MB86941
only).
RDYOUT# O 49 Ready Out
This is the output pin for the ready signal generated by
the module RCSTG.
When the module RCSTG is used to generate the
external resource chip select signals CS0#-CS3#,
read strobe signal RE#, write strobe signal WE#, and
data strobe signal DS#, the ready signal is output from
these pins to the MPU.
When any of the signals CS0# to CS1# is at “L” level,
this signal is asserted with the designated timing
interval.
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