PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 31

• Manufacturer Part Number: PEB22554
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

In case 16-bit data bus width is selected by fixing pin DBW to logical ‘1’ word access to
the FIFOs is enabled. Data output to bus lines D0-D15 as a function of the selected
interface mode is shown in figure 6 and 7. Of course, byte access is also allowed.The
effective length of the accessible part of RFIFO can be changed from 32 bytes (RESET
value) down to 2 bytes independent for each channel.
Figure 6
FIFO Word Access (Intel Mode)
Semiconductor Group
D15
32
32
1
4
3
2
1
D8 D7
RFIFO
Byte 4
Byte 3
Byte 2
Byte 1
D0
31
D15
32
32
1
4
3
2
1
Functional Description E1
D8
XFIFO
Byte 4
Byte 3
Byte 2
Byte 1
D7
PEB 22554
ITD01798
D0
09.98