Host-Port Interface (Uhpi) - Texas Instruments AM1808 User Manual

AM1808
SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014

6.25 Host-Port Interface (UHPI)

6.25.1 HPI Device-Specific Information
The device includes a user-configurable 16-bit Host-port interface (HPI16).
The host port interface (UHPI) provides a parallel port interface through which an external host processor
can directly access the processor's resources (configuration and program/data memories). The external
host device is asynchronous to the CPU clock and functions as a master to the HPI interface. The UHPI
enables a host device and the processor to exchange information via internal or external memory.
Dedicated address (HPIA) and data (HPID) registers within the UHPI provide the data path between the
external host interface and the processor resources. A UHPI control register (HPIC) is available to the
host and the CPU for various configuration and interrupt functions.
6.25.2 HPI Peripheral Register Description(s)
BYTE ADDRESS
0x01E1 0000
0x01E1 0004
0x01E1 0008
0x01E1 000C
0x01E1 0010
0x01E1 0014
0x01E1 0018
0x01E1 001C
0x01E1 0020
0x01E1 0024
01E1 0028
01E1 002C
01E1 0030
01E1 0034
01E1 0038
01E1 000C - 01E1 07FF
(1) There are two 32-bit HPIA registers: HPIAR for read operations and HPIAW for write operations. The HPI can be configured such that
HPIAR and HPIAW act as a single 32-bit HPIA (single-HPIA mode) or as two separate 32-bit HPIAs (dual-HPIA mode) from the
perspective of the Host. The CPU can access HPIAW and HPIAR independently.
210 Peripheral Information and Electrical Specifications
Table 6-111. HPI Control Registers
ACRONYM
PID Peripheral Identification Register
PWREMU_MGMT HPI power and emulation management register
- Reserved
GPIO_EN General Purpose IO Enable Register
GPIO_DIR1 General Purpose IO Direction Register 1
GPIO_DAT1 General Purpose IO Data Register 1
GPIO_DIR2 General Purpose IO Direction Register 2
GPIO_DAT2 General Purpose IO Data Register 2
GPIO_DIR3 General Purpose IO Direction Register 3
GPIO_DAT3 General Purpose IO Data Register 3
- Reserved
- Reserved
HPIC HPI control register
HPIA HPI address register
(1)
(HPIAW) (Write)
HPIA HPI address register
(1)
(HPIAR) (Read)
- Reserved
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COMMENTS
The CPU has read/write access
to the PWREMU_MGMT register.
The Host and the CPU both have
read/write access to the HPIC
register.
The Host has read/write access
to the HPIA registers. The CPU
has only read access to the
HPIA registers.