BT8954 CONEXANT [Conexant Systems, Inc], BT8954 Datasheet - Page 87

• Manufacturer Part Number: BT8954
• Description: VOICE PAIR GAIN FRAMER
• Manufacturer: CONEXANT [Conexant Systems, Inc]

Bt8954
Voice Pair Gain Framer
5.1.6 Microcomputer Interface Timing
Table 5-7. Microcomputer Interface Timing Requirements
N8954DSC
NOTE(S):
(1)
(2)
Symbol
20
21
22
23
24
25
26
27
28
29
30
31
32
In Intel mode, Write Strobe* is defined as (WR* or CS*). In Motorola mode, it is defined as (DS or CS) when R/W is low.
In Intel mode, Read Strobe* is defined as (RD* or CS). In Motorola mode, it is defined as (DS or CS) when R/W is high.
ALE Pulse-Width High
Address Setup Prior to ALE Falling Edge
Address Hold after ALE Low
ALE Low Prior to Write Strobe Falling Edge
Write Strobe Pulse-Width Low
Read Strobe Pulse-Width Low
Data in Setup Prior to Write Strobe Rising Edge
Data in Hold after Write Strobe High
R/W* Setup Prior to Read/Write Strobe Falling Edge
R/W* Hold after Read*/Write Strobe* High
ALE Falling Edge after Write Strobe* High
ALE Falling Edge after Read Strobe* High
RST* Pulse-Width Low
Microcomputer interface timing and switching requirements are displayed in
Tables 5-6 and 5-7.
MCI write timing, Intel mode (MOTEL = 0) is illustrated in
MCI write timing, Motorola mode (MOTEL = 1) is illustrated in
MCI read timing, Intel mode (MOTEL = 0) is illustrated in
MCI read timing, Motorola mode (MOTEL = 1) is illustrated in
Internal write timing is illustrated in
(2)
(1)
Parameter
(1)
(1)
Conexant
(1)
Figure
5.0 Electrical and Mechanical Specifications
5-8.
Minimum
30
15
20
40
50
30
10
10
20
20
50
5
5
5.1 Electrical Specifications
Figure
Figure
Maximum
Figure
Figure
—
—
—
—
—
—
—
—
—
—
—
—
—
5-6.
5-4.
5-7.
5-5.
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
5-5