
Data Sheet
July 2000
DSP16210 Digital Signal Processor
Lucent Technologies Inc.
DRAFT COPY
99
Software Architecture
(continued)
Registers
(continued)
Register Settings
(continued)
Table 54. ioc (I/O Configuration) Register
15—11
Reserved
10
9
8
7—5
4
3
2
1
0
WDDLY SIOLB EBIO
CKOSEL[2:0]
WEROM
RWNADV
DENB2 DENB1 DENB0
Bit
Field
Reserved
WDDLY
(Write Data
Delay)
Value
—
0
Description
15—11
10
Reserved—write with zero.
Drive write data onto DB[15:0] approximately one half-cycle of CKO
after RWN
goes low.
Drive write data onto DB[15:0] approximately one cycle of CKO
after RWN goes
low.
SSIO: Deselect loopback.
SSIO: Select loopback, i.e., loop back DO to DI.
Pin Multiplexing: Select VEC[3:0] for the VEC[3:0]/IOBIT[7:4]
pins.
Pin Multiplexing: Select the high half of BIO, IOBIT[7:4], for the
VEC[3:0]/IOBIT[7:4]
pins.
CLK: Internal free-running clock.
CLKE: Internal free-running clock suspended (held high) during low-power
standby mode (AWAIT bit of
alf
register is set).
ZERO: Held low.
Reserved.
CKI: Output of CKI clock input buffer.
ZERO: Held low.
ONE: Held high.
ONE: Held high.
Selects YMAP0. This allows for external ERAMHI and ERAMLO requests.
Selects YMAP1. Forces all ERAM requests to access EROM instead. If
WEROM is set, the DENB1 field (
ioc
bit 1) and the RDYEN1 and YATIM[3:0]
fields (
mwait
bits 13 and 7—4) control Y-side accesses to EROM.
Delay leading edge of RWN.
Do not delay RWN.
1
9
SIOLB
(SIO Loopback)
EBIO
(Enable BIO)
0
1
0
1
8
7—5
CKOSEL[2:0]
(Selection
Control for CKO
output pin)
000
001
010
011
100
101
110
111
0
1
4
WEROM
(Write EROM)
3
RWNADV
(RWN Pin
Advance)
DENB2
(Delay Enable)
DENB1
(Delay Enable)
0
1
2
0
1
0
1
Do not delay IO enable.
Delay leading edge of IO enable by one half-cycle of CKO
.
Do not delay ERAM, ERAMHI, and ERAMLO enables.
Delay leading edge of ERAM, ERAMHI, and ERAMLO enables by one half-cycle
of CKO
.
Do not delay EROM enable.
Delay leading edge of EROM enable by one half-cycle of CKO
.
1
0
DENB0
(Delay Enable)
0
1
Assuming that the CKO pin is programmed as the internal clock CLK, i.e., CKOSEL[2:0] = 000.
VEC0 corresponds to IOBIT7, VEC1 corresponds to IOBIT6, VEC2 corresponds to IOBIT5, and VEC3 corresponds to IOBIT4.