H
O
ST INTERFACE
(H
I32
)
HO
ST POR
T
SI
G
NALS
MOTOR
OLA
DS
P56305
User’s
Manual
6
-97
HLOCK
Lock
Sustained tri-state bidirectional
signal.
c
HLOCK
indicates an atomic
operation that may require multiple
transactions to complete. When
HLOCK
is asserted, non-exclusive
transactions to the HI32 will be
‘retried’ (i.e. this is an entire resource
lock).
HBS
(Bus Strobe)
Schmitt trigger input signal.
Asserted at the start of a bus cycle (for half of a clock cycle)
providing an “early bus start” signal. This enables the
HI32 to respond (HTA valid) earlier.
HBS should be forced or pulled up to Vcc if not used (e.g.
ISA bus).
HPAR
Parity
Tri-state, bidirectional signal.
Even parity across HAD31-HAD0 and
HC3
/
HBE3-HC0/HBE0. The master
drives HPAR during address and
write data phases; the target drives
HPAR during read data phases.
HDAK
Host DMA Acknowledge
Schmitt trigger input signal.
HDAK indicates that the external DMA channel is
accessing the HI32. The HI32 is selected as a DMA device
if HDAK and HWR or HRD (in the double-strobe mode) or
HDAK and HDS (in the single-strobe mode) are asserted.
HDAK should be forced or pulled up to Vcc if not used.
Disconnected
Table 6-18
Host Port Signals - Detailed Description (Sheet 5 of 13)
HI32
Port
Pin
a
HI32 Mode
PCI Enhanced
Universal
Universal
GPIO
b
Содержание DSP56305
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Страница 146: ...5 2 DSP56305 User s Manual MOTOROLA General Purpose I O 5 1 Introduction 5 3 5 2 Programming Model 5 3 ...
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