13
Table 1.3
Pin Functions (cont)
Type
Symbol
Pin No.
(FP-112)
Pin No.
(TFP-120)
I/O Name and Function
Bus control
(cont)
WAIT
56
59
I
Wait: Requests the insertion of wait states
(T
W
) into the bus cycle when the external
address space is accessed.
RAS
54
57
O
Row address strobe: DRAM row-address
strobe timing signal.
CASH
49
52
O
Column address strobe high: DRAM column-
address strobe timing signal. Output to access
the upper eight data bits.
CASL
51
54
O
Column address strobe low: DRAM column-
address strobe timing. Output to access the
lower eight data bits.
RD
59
64
O
Read: Indicates reading of data from an
external device.
WRH
58
63
O
Upper write: Indicates write access to the
upper eight bits of an external device.
WRL
57
62
O
Lower write: Indicates write access to the
lower eight bits of an external device.
CS0
–
CS7
48–51,
53–56
51–54,
56–59
O
Chip select 0–7: Chip select signals for
accessing external memory and devices.
AH
63
68
O
Address hold: Address hold timing signal for a
device using a multiplexed address/data bus.
HBS
,
LBS
23, 58
24, 63
O
Upper/lower byte strobe: Upper and lower
byte strobe signals. (Also used as
WRH
and
A0.)
WR
57
62
O
Write: Brought low during write access. (Also
used as
WRL
.)
DMAC
DREQ0
,
DREQ1
67, 69
72, 74
I
DMA transfer request (channels 0 and 1):
Input pins for external DMA transfer requests.
DACK0,
DACK1
66, 68
71, 73
O
DMA transfer acknowledge (channels 0 and
1): Indicates that DMA transfer is
acknowledged.
TIOCA0,
TIOCB0
53, 55
56, 58
I/O ITU input capture/output compare (channel 0):
Input capture or output compare pins.
TIOCA1,
TIOCB1
64, 65
69, 70
I/O ITU input capture/output compare (channel 1):
Input capture or output compare pins.
TIOCA2,
TIOCB2
97, 98
103, 105
I/O ITU input capture/output compare (channel 2):
Input capture or output compare pins.
TIOCA3,
TIOCB3
100, 101
107, 108
I/O ITU input capture/output compare (channel 3):
Input capture or output compare pins.
16-bit
integrated
timer pulse
unit (ITU)
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Страница 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
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