AC4830xC-C Data Book
Chapter 2. Functional Description
Revision 1.0
17
March 2000
2.2.3 Host Port Interface
The Host Port Interface (HPI) is an 8-bit parallel port used for communications between
the Host processor and AC4830xC-C. Both the Host processor and AC4830xC-C can
access and exchange information through the on-chip shared memory of the
AC4830xC-C. Please refer to the HPI on-chip Memory Map in Figure
2-10 on page 24.
An 8-bit data bus (HD0 to HD7) exchanges information with the Host. Because of its
16-bit word structure, the AC4830xC-C expects all transfers to consist of two
consecutive bytes. A dedicated pin (HI/LO) indicates whether the first or second byte is
being transferred.
Two control pins, HRS0 and HRS1, control Host access to the HPI. The Host can
access the internal control register and address the internal memory.
The Host can also interrupt the AC4830xC-C by writing to its internal control register.
Conversely, the AC4830xC-C can interrupt the Host with the HINT- signal, which the
Host can acknowledge and clear.
Figure
2-5 illustrates the signals of the Host Port Interface.
Figure
2-5: AC4830xC-C Host Port Interface (HPI) Signals
VOICE
Interface
Host Port Interface
HOST
MEMORY & I/O
Interface
HD0-HD7
AC4830xC-C
HI/LO-
HWR-
HAS-
HRS0-1
HRD-
HR/W-
HRDY
HINT-
HPISEL-
CS-
TAP
Содержание AC4830 C-C Series
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