ADSP-TS101S(RevA) データシートの表示（PDF） - Analog Devices
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ADSP-TS101S Datasheet PDF : 44 Pages
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ADSP-TS101S
Table 6. Pin Definitions—External Port Arbitration (continued)
Signal
Type
Term Description
HBG3
CPA
DPA
I/O/T
nc Host Bus Grant. Acknowledges HBR and indicates that the host can take
(pu2)
control of the external bus. When relinquishing the bus, the master DSP
three-states the ADDR31–0, DATA63–0, MSH, MSSD, MS1–0, RD, WRL,
WRH, BMS, BRST, FLYBY, IOEN, RAS, CAS, SDWE, SDA10, SDCKE,
LDQM and HDQM pins, and the DSP puts the SDRAM in self-refresh mode.
The DSP asserts HBG until the host deasserts HBR. In multiprocessor
systems, the current bus master DSP drives HBG, and all slave DSPs monitor
HBG.
I/O (o/d) See Core Priority Access. Asserted while the DSP’s core accesses external memory.
next This pin enables a slave DSP to interrupt a master DSP’s background DMA
col. transfers and gain control of the external bus for core-initiated transactions.
CPA is an open drain output, connected to all DSPs in the system. The CPA
pin has an internal 500 Ω pull-up resistor, which is only enabled on the DSP
with ID2–0 = 0. If ID0 is not used, terminate this pin as either epu or nc. If
ID7–1 is not used, terminate this pin as epu.
I/O (o/d) See DMA Priority Access. Asserted while a high priority DSP DMA channel
next accesses external memory. This pin enables a high priority DMA channel on
col. a slave DSP to interrupt transfers of a normal priority DMA channel on a
master DSP and gain control of the external bus for DMA-initiated transac-
tions. DPA is an open drain output, connected to all DSPs in the system. The
DPA pin has an internal 500 Ω pull-up resistor, which is only enabled on the
DSP with ID2–0 = 0. If ID0 is not used, terminate this pin as either epu or
nc. If ID7–1 is not used, terminate this pin as epu.
Type column symbols: A = Asynchronous; G = Ground; I = Input; O = Output; o/d = Open drain output; P = Power supply;
pd = Internal pull-down approximately 100 kΩ; pu = Internal pull-up approximately 100 kΩ; T = Three-state
Term (for termination) column symbols: epd = External pull-down approximately 10 kΩ to VSS; epu = External pull-up approximately 10 kΩ to VDD-IO
nc = Not connected; au = Always used.
1 The internal pull-down may not be sufficient. A stronger pull-down may be necessary.
2 See ELECTRICAL CHARACTERISTICS on Page 19 for maximum and minimum current consumption for pull-up and pull-down resistances.
3 The internal pull-up may not be sufficient. A stronger pull-up may be necessary.
Table 7. Pin Definitions—External Port DMA/Flyby
Signal
Type
Term Description
DMAR3–0
FLYBY1
IOEN1
I/A
epu
O/T (pu2) nc
O/T (pu2) nc
DMA Request Pins. Enable external I/O devices to request DMA services
from the DSP. In response to DMARx, the DSP performs DMA transfers
according to the DMA channel’s initialization. The DSP ignores DMA
requests from uninitialized channels.
Flyby Mode. When a DSP DMA channel is initiated in FLYBY mode, it
generates flyby transactions on the external bus. During flyby transactions, the
DSP asserts FLYBY, which signals the source or destination I/O device to
latch the next data or strobe the current data, respectively, and to prepare for
the next data on the next cycle.
I/O Device Output Enable. Enables the output buffers of an external I/O device
for flyby transactions between the device and external memory. Active on flyby
transactions.
Type column symbols: A = Asynchronous; G = Ground; I = Input; O = Output; o/d = Open drain output; P = Power supply;
pd = Internal pull-down approximately 100 kΩ; pu = Internal pull-up approximately 100 kΩ; T = Three-state
Term (for termination) column symbols: epd = External pull-down approximately 10 kΩ to VSS; epu = External pull-up approximately 10 kΩ to VDD-IO
nc = Not connected; au = Always used.
1 The internal pull-up may not be sufficient. A stronger pull-up may be necessary.
2 See ELECTRICAL CHARACTERISTICS on Page 19 for maximum and minimum current consumption for pull-up and pull-down resistances.
–14–
REV. A
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