28500-DSH-002-C Datasheet, PDF (72/224 Pages) M/A-COM Technology Solutions, Inc. – Multichannel Synchronous Communications Controller

Expansion Bus (EBUS)
Figures 4-3 and 4-4 illustrate two examples of non-multiplexed address and data modes. Figure 4-3 illustrates four
separate byte-wide framer devices connected to the EBUS with each byte enable line used as the chip select for
separate devices, which allows a full dword data transfer over the EBUS.
Figure 4-3. EBUS Connection, Non-Multiplexed Address/Data, 8 Framers, No Local MPU
EAD[31:0]
EAD[31:24]
EAD[23:16]
EAD[15:8]
EAD[7:0]
EAD[8:0]
AS*, R/WR*, DS*,
ECLK Control Lines
EBE[3:0]*
EAD9
EBE[0]*
EBE[1]*
EBE[2]*
EBE[3]*
Chip
Select
Logic
Data Addr
Bt8370
CS*
Data Addr
Bt8370
CS*
Data Addr
Bt8370
CS*
Data Addr
Bt8370
CS*
Device 0,4
dev 0,4
Device 1,5
Device 2,6 Device 3,7
GENERAL NOTE:
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.
500052_050
Figure 4-4 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.
The framers configuration in shared memory is that only the Least Significant Byte (LSB) contains the information
of one frame configuration, the others are unused.
28500-DSH-002-C
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