CD2401 Intel, CD2401 Datasheet - Page 20

• Manufacturer Part Number: CD2401
• Description: Multi-protocol Communications Controller
• Manufacturer: Intel

CD2401 — Multi-Protocol Communications Controller
20
BYTESWAP
Table 1.
Symbol
GND
V
DD
Pin Descriptions (Sheet 4 of 4)
2, 20, 62, 70,
8, 45, 79, 96
Number
82, 99
Pin
31
Type
–
–
I
BYTESWAP: This pin alters the byte ordering of data during certain 16-bit
transfers and changes the half of the data bus on which byte transfers are made
to comply with Intel or Motorola processor systems. BYTESWAP does not
alter the bus handshake signals. When the BYTESWAP pin is high, the byte of
A/D[7:0] precedes that of A/D[15:8] in a string of transmit or receive bytes; when
BYTESWAP is low, A/D[15:8] precedes A/D[7:0].
When the BYTESWAP pin is high, bytes are transferred on A/D[7:0] when A[0]
is low, and on A/D[15:8] when A[0] is high. When BYTESWAP is low, bytes are
transferred on A/D[15:8] when A[0] is low, and A/D[7:0] when A[0] is high. A
different register map is used, depending on the state of this pin.
POWER
GROUND
BYTESWAP
0
1
Description
Byte Alignment
Motorola
Intel
Datasheet