TMP92CF30
2009-06-15
92CF30-161
(4)
Wait control
The external bus cycle completes in two states at minimum (25 ns at f
SYS
=
80 MHz)
without inserting a wait state.
Setting up the BnCSL<BnWW3:BnWW0> bits specifies the number of wait states to be
inserted in a write cycle, and setting the BnCSL<BnWR3:BnWR0> bits specifies the
number of wait states to be inserted in a read cycle. The external bus cycle can be
programmed as follows;
BnCSL<BnWW>/<BnWR>
<BnWW3>
<BnWR3>
<BnWW2>
<BnWR2>
<BnWW1>
<BnWR1>
<BnWW0>
<BnWR0>
Number of Wait States
0
0
0
1
2 states (0 wait state), fixed wait-state mode
0
0
1
0
3 states (1 wait state), fixed wait-state mode (Default)
0
1
0
1
4 states (2 wait states), fixed wait-state mode
0
1
1
0
5 states (3 wait states), fixed wait-state mode
0
1
1
1
6 states (4 wait states), fixed wait-state mode
1
0
0
0
7 states (5 wait states), fixed wait-state mode
1
0
0
1
8 states (6 wait states), fixed wait-state mode
1
0
1
0
9 states (7 wait states), fixed wait-state mode
1
0
1
1
10 states (8 wait states), fixed wait-state mode
1
1
0
0
11 states (9 wait states), fixed wait-state mode
1
1
0
1
12 states (10 wait states), fixed wait-state mode
1
1
1
0
14 states (12 wait states), fixed wait-state mode
1
1
1
1
18 states (16 wait states), fixed wait-state mode
0
1
0
0
22 states (20 wait states), fixed wait-state mode
0 0 1 1
6
WAIT
pin input mode
Other than the above
Reserved
Note 1: For SDRAM, the above settings are not effective. Refer to Section 3.11, SDRAM controller.
Note 2: For NAND flash memory, the above settings are not effective.
(a)
Fixed wait-state mode
The bus cycle is completed in the specified number of states. The number of states
can be selected from 2 (0 wait state) through 12 (10 wait states), 14 (12 wait states), 18
(16 wait states) and 22 (20 wait states).
(b)
WAIT
pin input mode
In this mode, the
WAIT
signal is sampled. A wait state is continued to be inserted
while the
WAIT
signal is sampled active. The minimum bus cycle in this mode is six
states. The bus cycle is completed if the
WAIT
signal is sampled High at the rising
edge of SDCLK in the sixth state. The bus cycle is extended as long as the
WAIT
signal
remains active after sixth state.
Summary of Contents for TLCS-900/H1 Series
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