28478G-18 Mindspeed Technologies, 28478G-18 Datasheet - Page 66

• Manufacturer Part Number: 28478G-18
• Description: Multichannel Synchronous Communications Controller 208-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of 28478G-18

• Package: 208BGA
• Maximum Data Rate: 32768 Kbps
• Transmission Media Type: Wire
• Power Supply Type: Analog
• Typical Supply Current: 250 mA
• Typical Operating Supply Voltage: 3.3 V
• Minimum Operating Supply Voltage: 3 V
• Maximum Operating Supply Voltage: 3.6 V

6. If BGACK* is deasserted, MUSYCC assumes control of the EBUS by asserting BGACK*.
7. MUSYCC drives EAD[31:0], EBE*[3:0], R/WR*, DS*, AS*.
8. Shortly after the EBUS cycle is started, MUSYCC deasserts BR*.
9. Bus arbiter deasserts BG* shortly thereafter.
10. MUSYCC completes EBUS cycle.
11. MUSYCC deasserts BGACK*.
12. MUSYCC three-states EAD[31:0], EBE*[3:0]. R/WR*, DS*, and AS*.
3.1.11
Using the EBUS address lines, EAD[17:0], and the byte enable lines, EBE[3:0]*, the EBUS can be connected in
either a multiplexed or non-multiplexed address and data mode.
Figures 3-4
four separate byte-wide framer devices connected to the EBUS with each byte enable line used as the chip select
for separate devices. This allows a full dword data transfer over the EBUS.
Figure 3-4.
28478-DSH-002-E
8478_010
and
EBUS Connection, Non-multiplexed Address/Data, 8 Framers, No MPU
3-5
Connection
illustrate two examples of non-multiplexed address and data modes. These figures illustrate
EBE[3:0]*
Preliminary Information / Mindspeed Proprietary and Confidential
EAD[31:0]
EINT*
AS*, R/WR*, DS*,
ECLK Control Lines
Mindspeed Technologies
EAD9
EBE[0]*
EBE[1]*
EBE[2]*
EBE[3]*
EAD[31:24]
EAD[23:16]
EAD[15:8]
EAD[7:0]
EAD[8:0]
Select
Logic
Chip
dev 0,4
Data Addr
CS*
CN8370
Device 0,4
®
Data Addr
CS*
CN8370
Device 1,5
Data Addr
CS*
CN8370
Device 2,6
Expansion Bus (EBUS)
Data Addr
CS*
CN8370
Device 3,7
53