CN8478/CN8474A/CN8472A/CN8471A
3.0 Expansion Bus (EBUS)
Multichannel Synchronous Communications Controller (MUSYCC™)
3.1 Operation
Figure 3-5. EBUS Connection, Non-multiplexed Address/Data, 61 Framers, No MPU
EAD[31:24]
EAD[23:16]
EAD[31:0]
EAD[15:8]
EAD[7:0]
EAD[8:0]
8
9
8
9
8
9
8
9
EINT*
Data Addr
2xCN8370
CS*
Data Addr
2xCN8370
CS*
Data Addr
2xCN8370
CS*
Data Addr
2xCN8370
CS*
EAD[10,9]
Dev 0
Dev 1
Dev 2
Dev 3
Control
Lines
Dev 0, Bank 0
Control
EBE[3:0]
Dev 0, Bank 1
Dev 0, Bank 2
Dev 0, Bank 3
Dev 0, Bank 4
Chip
Select
Logic
8478_011
NOTE(S):
1. EBEx[3:0]* selects device x in each framer block.
2. EAD[31:0], AS* are supplied to each framer block.
3. EBEx*, AS* are supplied to each chip select block.
Figure 3-6 illustrates how additional address lines can be combined with each
byte enable line during the address phase to support multiple framer banks with
each bank containing four byte-wide framer devices.
In the multiplexed address and data mode, four byte-wide peripheral devices
are connected to the EBUS. In this mode, 8 bits of the 32-bit EBUS transfer data
to and from each device individually.
NOTE: The multiplexed address and data mode example does not allow for 4-byte
data transfers.
100660E
Conexant
3-9
CONEXANT [ CONEXANT SYSTEMS, INC ]
