High-Speed Differential Interfaces in Cyclone II Devices
RSDS I/O Standard Support in Cyclone II Devices
The RSDS specification is used in chip-to-chip applications between the
timing controller and the column drivers on display panels. Cyclone II
devices meet the National Semiconductor Corporation RSDS Interface
Specification and support the RSDS output standard. Table 11–2 shows
the RSDS electrical characteristics for Cyclone II devices.
Table 11–2. RSDS Electrical Characteristics for Cyclone II Devices Note (1)
Symbol
Parameter
Output supply voltage
Differential output voltage
Output offset voltage
Transition time
Condition
Min
2.375
100
Typ
Max
2.625
600
Unit
V
VCCIO
2.5
VOD (2)
VOS (3)
Tr/Tf
RL = 100 Ω
RL = 100 Ω
20% to 80%
mV
V
1.125
1.25
500
1.375
ps
Notes to Table 11–2:
(1) The specifications apply at the resistor network output.
(2) VOD = VOH - VOL
(3) VOS = (VOH + VOL) / 2.
.
Figure 11–6 shows the RSDS transmitter output signal waveforms.
Figure 11–6. Transmitter Output Signal Level Waveforms for RSDS Note (1)
Single-Ended Waveform
Positive Channel (p) = V
OH
V
OD
Negative Channel (n) = V
OL
V
OS
Ground
Differential Waveform (Mathematical Function of Positive & Negative Channel)
V
OD
0 V
V
OD
p − n (2)
Notes to Figure 11–6:
(1) The VOD specifications apply at the resistor network output.
(2) The p – n waveform is a function of the positive channel (p) and the negative channel (n).
Altera Corporation
February 2007
11–7
Cyclone II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
