Interface; Parallel Interface (Forward Channel) - Epson Stylus PHOTO 890 Service Manual

EPSON Stylus PHOTO 890/1280/1290

1.3 Interface

The EPSON Stylus PHOTO 890/1280/1290 provides USB and parallel interfaces as
standard.

1.3.1 Parallel Interface (Forward Channel)

o
Transmission Mode: 8 bit parallel, IEEE-1284 compatibility mode
o
Synchronization: By STROBE pulse
o
Handshaking: By BUSY and ACKNLG signal
o
Signal Level: TTL compatible level
o
Adaptable Connector: 57-30360 (amphenol) or equivalent
DATA data byte n
-STROBE
t
setup
BUSY
t
ready
-ACKNLG
Figure 1-7. Data Transmission Timing
PRODUCT DESCRIPTIONS
data byte n+1
t
hold
t
next
t
stb
t
busy
t t t
ack
reply nbusy
Parameter
tsetup
thold
tstb
tready
tbusy
tt-out*
tt-in**
treply
tack
tnbusy
tnext
* Rise and fall time of every output signal.
** Rise and fall time of every input signal.
*** Typical timing for tack is shown on the following page.
Table 1-10. Typical Time of Tack
Parallel I/F Mode
High Speed
Normal Speed
Interface
Table 1-9. Parameters
Minimum Maximum
500ns
500ns
500ns
0
- 500ns
- 120ns
- 200ns
0
500ns
0
0
Typical Time of tack
0.5us
2us
Revision C
-
-
-
-
-
10us
-
-
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