CN8478/CN8474A/CN8472A/CN8471A
5.0 Memory Organization
Multichannel Synchronous Communications Controller (MUSYCC™)
5.2 Descriptors
Table 5-6. Global Configuration Descriptor (2 of 2)
Bit
Field
Name
Value
Description
10
MPUSEL
0
Expansion Bus Microprocessor Selection, Motorola-style. Expansion bus supports the
Motorola-style microprocessor interface and uses Motorola signals: Bus Request
(BR*), Bus Grant (BG*), Address Strobe (AS*), Read/Write (R/WR*), and Read Strobe
(RD*).
1
Expansion Bus Microprocessor Selection, Intel-style. Expansion bus supports the
Intel-style microprocessor interface and uses Intel signals: Hold Request (HOLD), Hold
Acknowledge (HLDA), Address Latch Enable (ALE*), Write Strobe (WR*), and Data
Strobe (DS*).
9:8
ALAPSE[1:0]
0–3
Expansion Bus Address Duration. MUSYCC extends the duration of valid address bits
during an EBUS address phase to ALAPSE+1 number of ECLK periods. The control
lines ALE* (Intel) or AS* (Motorola) indicate that the address bits have had the desired
setup time.
7
RSVD
0
Reserved.
6:4
ELAPSE[2:0]
0–7
Expansion Bus Data Duration. MUSYCC extends the duration of valid data bits during
an EBUS data phase to ELAPSE+1 number of ECLK periods. The control lines RD* and
WR* (Intel) or DS* and R/WR* (Motorola) indicate that the data bits have had the
desired setup time.
3
2
INTAMSK
INTBMSK
0
1
0
1
0
INTA interrupt enabled.
INTA interrupt disabled.
INTB interrupt enabled.
INTB interrupt disabled.
1:0
PORTMAP[1:0]
Default.
Port 0 mapped to Channel Group 0.
Port 1 mapped to Channel Group 1.
Port 2 mapped to Channel Group 2.
Port 3 mapped to Channel Group 3.
Port 4 mapped to Channel Group 4.
Port 5 mapped to Channel Group 5.
Port 6 mapped to Channel Group 6.
Port 7 mapped to Channel Group 7.
1
Port 0 mapped to Channel Groups 0 and 1.
Port 1 mapped to Channel Groups 2 and 3.
Port 2 mapped to Channel Groups 4 and 5.
Port 3 mapped to Channel Groups 6 and 7.
2
3
Port 0 mapped to Channel Groups 0, 1, 2, and 3.
Port 1 mapped to Channel Groups 4, 5, 6, and 7.
Reserved.
100660E
Conexant
5-11
CONEXANT [ CONEXANT SYSTEMS, INC ]
