
Introduction
22
November 2002 Revised January 2005
SPRS205D
Table 23. Signal Descriptions (Continued)
TERMINAL
NAME
RESET
CONDITION
BK
FUNCTION
I/O/Z
MULTIPLEXED
SIGNAL NAME
PARALLEL BUS (CONTINUED)
C4
I/O/Z
EMIF chip select for memory space CE0 or general-purpose IO9. This pin
serves in one of two functions: EMIF chip select for memory space CE0
(EMIF.CE0) or general-purpose IO9 (GPIO9). The initial state of this pin
depends on the GPIO0 pin. See Section 3.5.1 for more information.
GPIO0 = 1:
Output,
EMIF.CE0
EMIF.CE0
O/Z
Active-low EMIF chip select for memory space CE0. EMIF.CE0 is selected
when the Parallel Port Mode bit field of the External Bus Selection Register
is set to 00 or 01.
BK
GPIO0 = 0:
Input,
GPIO9
GPIO9
I/O/Z
General-purpose IO9. GPIO9 is selected when the Parallel Port Mode bit
field of the External Bus Selection Register is set to 10 or 11.
C5
I/O/Z
EMIF chip select for memory space CE1 or general-purpose IO10. This pin
serves in one of two functions: EMIF chip-select for memory space CE1
(EMIF.CE1) or general-purpose IO10 (GPIO10). The initial state of this pin
depends on the GPIO0 pin. See Section 3.5.1 for more information.
GPIO0 = 1:
Output,
EMIF.CE1
EMIF.CE1
O/Z
Active-low EMIF chip select for memory space CE1. EMIF.CE1 is selected
when the Parallel Port Mode bit field of the External Bus Selection Register
is set to 00 or 01.
BK
GPIO0 = 0:
Input,
GPIO10
GPIO10
I/O/Z
General-purpose IO10. GPIO10 is selected when the Parallel Port Mode
bit field of the External Bus Selection Register is set to 10 or 11.
C6
I/O/Z
EMIF chip select for memory space CE2 or HPI control input 0. This pin
serves in one of two functions: EMIF chip-select for memory space CE2
(EMIF.CE2) or HPI control input 0 (HPI.HCNTL0). The initial state of this
pin depends on the GPIO0 pin. See Section 3.5.1 for more information.
GPIO0 = 1:
Output,
EMIF.CE2
EMIF.CE2
O/Z
Active-low EMIF chip select for memory space CE2. EMIF.CE2 is selected
when the Parallel Port Mode bit field of the External Bus Selection Register
is set to 00 or 01.
BK
GPIO0 = 0:
Input,
HPI.HCNTL0
HPI.HCNTL0
I
HPI control input 0. This pin, in conjunction with HPI.HCNTL1, selects a
host access to one of the three HPI registers. HPI.HCNTL0 is selected
when the Parallel Port Mode bit field of the External Bus Selection Register
is set to 10 or 11.
C7
I/O/Z
EMIF chip select for memory space CE3, general-purpose IO11, or HPI
control input 1. This pin serves in one of three functions: EMIF chip-select
for memory space CE3 (EMIF.CE3), general-purpose IO11 (GPIO11), or
HPI control input 1 (HPI.HCNTL1). The initial state of this pin depends on
the GPIO0 pin. See Section 3.5.1 for more information.
GPIO0 = 1:
Output,
EMIF.CE3
EMIF.CE3
O/Z
Active-low EMIF chip select for memory space CE3. EMIF.CE3 is selected
when the Parallel Port Mode bit field is of the External Bus Selection
Register set to 00 or 01.
BK
GPIO0 = 0:
Input,
HPI.HCNTL1
GPIO11
I/O/Z
General-purpose IO11. GPIO11 is selected when the Parallel Port Mode
bit field is set to 10.
HPI.HCNTL1
I
HPI control input 1. This pin, in conjunction with HPI.HCNTL0, selects a
host access to one of the three HPI registers. The HPI.HCNTL1 mode is
selected when the Parallel Port Mode bit field is set to 11.
I = Input, O = Output, S = Supply, Hi-Z = High-impedance
BK = bus keeper (the bus keeper maintains the previous voltage level during reset or while the output pin is not driven), PU = pullup,
PD = pulldown, H = hysteresis input buffer, FS = fail-safe buffer