TMP19A43CD Datasheet, PDF (175/523 Pages) Toshiba Semiconductor – 32-bit RISC Microprocessor

TMP19A43
By setting the bit 3<P33F> of port 3 function register P3FC to "1," the WAIT input pin (P33) can also
serve as the RDY input pin.
The RDY input is input to the external bus interface circuit as the logical reverse of the WAIT input. The
number of waits is specified by the chip selector and wait controller register, BmnCS<BnW>.
Fig. 8-7 shows the RDY inputs and the number of waits.
tsys
fsys
2 waits automatically inserted
A[23:0]
D[15:0]
/RD
/RDY
2 waits automatically inserted + 2N (N=1)
A[23:0]
D[15:0]
/RD
2 waits automatically
inserted
/RDY
2 waits automatically
inserted
2N_WAIT
z --- External RDY sampling point
External RDY sampling points take place before a cycle of waits automatically
inserted is finished and before a 2N_wait cycle is finished as shown above.
The same applies to combinations of other numbers of waits.
Fig. 8-7 RDY Input and Wait Operation Timing Diagram
TMP19A43 (rev2.0) 8-13
External Bus Interface