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參數(shù)資料
| 型號： | T90FJR |
| 廠商： | ATMEL CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Dual Common Interface Hardware Controller- CIMax |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP128 |
| 封裝： | PLASTIC, QFP-128 |
| 文件頁數(shù)： | 15/41頁 |
| 文件大?。?/td> | 617K |
| 代理商： | T90FJR |
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15
T90FJR
Rev. A
–
7-Sep-01
External peripheral control signals
CIMaX
outputs a chip select EXTCS. This output is fully configurable through the Des-
tination Select register to be open-drain or push-pull output driver and active high or low.
The activation of this output can be programmed to be automatically the default selec-
tion when none of the modules is selected (bit DEF = 1 in the external access auto
select mask low register) and CS input is asserted or when address match the external
access auto select mask and pattern registers on the same basis as for the modules
auto selection when DEF = 0.
The EXTCS output can also be manually chosen to be the destination when AUTOSEL
bit is 0 in the Destination Select Register and when SEL = 11.
In addition, the EXTCS output can work in two ways :transmit mode or regenerate mode
selected by the XCSMOD in the Destination Select Register.
The EXTCS output reproduces the CS input whenever the external device selection
conditions are met in the CIMaX
, regardless of the selection mode (automatic / man-
ual, default / pattern match). This mode permits to insert the CIMaX
in an existing
hardware architecture by replacing an existing peripheral by the CIMaX
on the
address decoder and connecting this peripheral to the CIMaX
. The address decoding
must then be set up properly on the address decoder and in the CIMaX
to match the
new hardware architecture but no extra CS is needed on the address decoder ; the
CIMaX
provides a new one in replacement of the one it needs. The following table
gives the maximum propagation delay according to different conditions (70
°
C):
In regenerate mode, the EXTCS output acts as CEx# outputs to the modules as it is
generated by the internal CIMaX
state machine in conjunction with assertion of
IORD# or IOWR#. This mode permits to access to any 8-bit peripheral accessed with a
RD, a WR and a CS input such as a static RAM or an UART for example with program-
mable access time provided by the CIMaX
.
The CIMaX
also provides an interrupt input. This input is rerouted to the INT output
connected to the host microprocessor through the interrupt manager of the CIMaX
.
EXTINT pin is programmable to be either active-high or active-low with the EXTLVL bit
in the Interrupt Config Register and is maskable with the EXTM bit in the Interrupt Mask
Register. The EXTINT input status can be monitored by reading the EXT bit in the Inter-
t7 min
37 ns
37 ns
37 ns
37 ns
37
ns
75
ns
Memory write
IO,
EC,
Ext
600ns
250ns
200ns
150ns
100n
s
Conditions
CS to EXTCS maximum time
Vcc
EXTCS Load
4.5 V
10 pF
9 ns
4.5 V
50 pF
13 ns
3.0 V
10 pF
13 ns
3.0 V
50 pF
16 ns
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