Computer Drive - Floppy Disk Drive User Manual

5.1 Physical Interface
C141-E224 5-9
Table 5.1 Physical Layer Electrical Requirements (3/3)
d) Receiver Specifications
Units Nom Min Max Comments
Z
diffRX,
RX Pair Differential
Impedance
Ohm 85 115
Z
s-eRX,
RX Single-Ended
Impedance
Ohm 40
e) OOB Specifications
Units Nom Min Max Comments
V
thresh,
OOB Signal Detection
Threshold
mVppd 100 50 200
UI
OOB,
UI During OOB Signaling
ps 666.67 646.67 686.67
COMINIT/COMRESET
and
COMWAKE
Transmit Burst Length
UI
OOB
160
COMINIT/COMRESET
Transmit Gap Length
UI
OOB
480
COMWAKE
Transmit Gap Length
UI
OOB
160
Units
May
detect
Shall
detect
Shall not
detect
Comments
COMWAKE
Gap Detection Windows
ns
55 ≤ T
< 175
101.3 ≤ T
< 112
T < 55 or ≥175
COMINIT/COMRESET
Gap Detection Windows
ns
175 ≤ T
< 525
304 ≤ T
< 336
T < 175 or ≥ 525