Timing Diagram
metROM8kx8 - c35/s35
+------------------------------------------------------------------------------+
| |
| austriamicrosystems AG |
| 0.35um CMOS c35/s35 - met. prog. ROM8kx8 datasheet |
| Revision NC - June 2004 |
| |
+------------------------------------------------------------------------------+
ROM TERMINALS
-------------
+---------------------+
| |
CS ------->| |
m+1 | |<----- VDD
AD[12:0]---/--->| met. prog. ROM8kx8 |<----- VSS
NRST ------->| |
| |
EN ------->| |
| |
+---------------------+
|
|
|
v
DO[7:0]
+---------------------+------+-----------------------------------+
| Signal name | I/O | FUNCTION |
+---------------------+------+-----------------------------------+
| CS | IN | The rising edge on CS set |
| | | a reading operation cycle |
+---------------------+------+-----------------------------------+
| AD[12:0] | IN | Address bus |
+---------------------+------+-----------------------------------+
| NRST | IN | disable memory access at |
| | | CS rising edge - Active at 0 |
+---------------------+------+-----------------------------------+
| EN | IN | switches the tri-state output |
| | | on DO - asynchronous to CS signal |
| | | EN = 1 ==> output in high |
| | | impedance state |
+---------------------+------+-----------------------------------+
| DO[7:0] | OUT | Data bus |
+---------------------+------+-----------------------------------+
| VDD | SUP | High level supply voltage |
+---------------------+------+-----------------------------------+
| VSS | SUP | Low level supply voltage |
+---------------------+------+-----------------------------------+
READ CYCLE TIMING
-----------------
CYCLE_TIME_MIN
|<-------------------------------------------->|
| CS_HIGH_TIME |
||<--------------------------------->| |
||___________________________________| |_________
| /| \ /
CS ___|__/|| AD_HOLD_TIME \______/
| |||------------->| | |
|<-|| | |<---->|
AD_SET_UP_TIME | CS_LOW_TIME
| | |
__ |___|_______________| ________________
ADi \/ | \XXXXXXXXXXXXXXXX/ \XXXXXX
__/\___|________________/XXXXXXXXXXXXXXXX\________________/XXXXXX
|
|
| ACCESS_TIME
|--------------->|
DOi | | ______________________________
_____/XXXXXXXXXXXXXXXXXX\/ \_______
\XXXXXXXXXXXXXXXXXX/\_______________________________/
| | |
| | |
| |
___ | _____|_____
|\ | / |
EN | \|_____________________________________________/| |
| | | |
|->| |---->|
LOW_Z_TIME HIGH_Z_TIME
NRST CYCLE
----------
_________ _________________
\ | / \ |
NRST \ ______________________|/ \|____________
| |
|NRST_SETUP_TIME |
|<----------|-------->|
| |NRST_HOLD_TIME
________________________ | __________________
/ \ | /
CS ____________/ \___|/