參數(shù)資料
型號(hào)： D6571E
廠商： Electronic Theatre Controls, Inc.
英文描述： Chip for an All-Digital Telephone Answering Machine with Flash Memory Interface
中文描述： 芯片的全數(shù)字電話應(yīng)答機(jī)與快閃記憶體介面
文件頁數(shù)： 87/117頁
文件大?。?/td> 551K
代理商： D6571E
D6571E Data Sheet
DS6571E.2
DSP GROUP, INC., 3120 SCOTT BOULEVARD
SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490
83
HOST D6571E COMMUNICATION INTERFACE
The HOST communication port is a 16-bit bi-directional
register. The D6571E will access this register internally by
one 16-bit wide access. The HOST assesses this register
via the 8-bit bus in two accesses: first low byte then high
byte. After the HOST writes a command to the High byte
of this register the D6571E accepts this command.
When the D6571E writes a status word to the
communication register it sets the
ACK
pin low which is
connected to the HOST for indication. The HOST can use
this pin as an interrupt or poll this signal periodically.
When the HOST reads the high byte of this register the
DSP sets the
ACK
bit high. The choice of high/low byte
for the HOST will be made by the HI/
LO
pin. The HOST
should read the low byte of the status word first, then the
high byte.
Table 1. Host Interface Signals
Pin Name
HSTDB[0..7]
Input/Output
HSTRD
HSTWR
ACK
HI/
LO
CS
Type (*)
Description
HOST 8-bit data bus
HOST READ line from register
HOST WRITE line into register
Flag to HOST status byte ready
High or Low byte select
Input
Input
Output
Input
Input
When
interface **
High,
disables
Host
* Input and Output are referenced to the D6571E-11.
** Connection to ground recommended when not used.
RD
WR
HI/LO
INT
The D6571E will send a status word only in response
to a Host command except for the initial Garbage Collection
Status word.
HSTRD
HI/LO
HSTDB(0-7)
tdr
thr
ACK
HSTWR
HI/LO
HSTDB(0-7)
tsw
thw
tww
DATA VALID
DATA VALID
thr = 2 ns minimum
tdr = 25 ns maximum
thw = 5 ns minimum
tsw = 30 ns minimum
tww = 55 ns minimum
HOST READ CYCLE
HOST WRITE CYCLE
Figure 7. D6571E - Host Interface Timing Data
8051
D6571E-11
P0
HSTDB[0-7]
HSTR
HSTW
HI/LO
ACK
Figure 6. Host Interface D6571E - 8051
CS
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