GMS30C7201 Datasheet, PDF (195/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

Fast AMBA Peripherals
Original
Byte Order
Pair 3
1
0
Reordered
Nibbles
0
1
Pair 0
Pair 2
1
1
0
0
Pair 1
Pair 1
0
0
1
1
Pair 2
Pair 0
0
1
1
0
Pair 3
DBP
1
2
3
4
Chips
4PPM
Data
Stream
1234123412341234
125ns
Time
Receive data sample counter frequency = 6x pulse width, each time-slot sampled on third clock
Figure 12-12: 4PPM Modulation Example
4.0Mbps FIr Frame Format
When the 4.0Mbps transmission rate is used, the high-speed serial/parallel (FIr) interface within
the FIr is used along with the 4PPM bit encoding. The high-speed frame format shown in Figure
12-13: High Speed Serial Frame Format for IrDA Transmission (4.0Mbps) on page 12-42 is
similar to the SDLC format with several minor modifications: the start/stop flags and CRC are
twice as long, and instead of one start flag, a preamble and start flag of differing length are used.
GMS30C7201 Data Sheet
12-41