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PDF NM9715 Data sheet ( Hoja de datos )
| Número de pieza | NM9715 | |
| Descripción | PCI Dual 1284 Printer Ports | |
| Fabricantes | NetMos | |
| Logotipo |  |
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NetMos
Technology
Nm9715
PCI Dual 1284 Printer Ports
Features
• Single 5-V Operation
• Low Power
• Pin-to-Pin compatible to Nm9705
• PCI compatible dual 1284 printer port
• Multi-mode compatible controller (SPP, PS2, EPP,
ECP)
• Fast data rates up to 1.5 Mbytes/s (parallel port)
• Re-map function for legacy ports
• 16 Byte FIFO (parallel)
• Microsoft Windows Compatible registers
• Software programmable mode selects
• 128-pin QFP package
Applications
• Printer server
• Portable backup units
• Printer interface
• Add on I/O cards
General Description
Ordering Information
The Nm9715 is a dual 1284 parallel port controller with
PCI bus interface. Nm9715 fully supports the existing
Centronics printer interface as well as PS/2, EPP, and
ECP modes.
The Nm9715 is ideally suited for PC applications, such
as high speed parallel port. The Nm9715 is available in
128-Pin QFP package, It is fabricated in an advanced
in submicron CMOS process to achieve low drain power
and high speed requirements.
Commercial Grade
Nm9715CV
128-QFP 0° C to +70° C
Industrial Grade
Nm9715EV
128-QFP -40° C to +85° C
NetMos Technology ♦ 2855 Kifer Road, suite 102, Santa Clara, CA 95051 ♦ Tel (408) 727-2177 ♦ Fax (408) 727-2180
1 page  
NetMos
Technology
Nm9715
PCI Dual 1284 Printer Ports
Pin Name 128
PEB
PEA
69
87
nBUSYB
nBUSYA
70
85
nACKB
nACKA
71
86
Type
I
I
I
nFAULTB 72
nFAULTA 83
I
nSTROBEB 76
nSTROBEA 81
O
nAUTOFDB 75
nAUTOFDA 80
O
nINITB
nINITA
74
79
O
nSLCTINB 73
nSLCTINA 78
O
PB7-PB5 105-107
PA7-PA4 98-95
PB4-PB0 109-113
PA3-PA0 93-90
I/O
I/O
Description
Paper empty (internal pull-up). This pin is set to high by peripheral/printer
when printer paper is empty.
Peripheral/printer busy (internal pull-up). This pin is set to high by peripheral/
printer, when printer or peripheral is not ready to accept data.
Peripheral/printer data acknowledge (internal pull-up). This pin is set to low
by peripheral/printer to indicate a successful data transfer has taken place.
During SPP mode when interrupt is enabled, nINTA pin follows the nACKA/
nACKB input pins state.
Peripheral/printer data error (internal pull-up). This pin is set to low by periph-
eral/printer during error condition.
Peripheral/printer data strobe (open drain, active low). On the rising edge of
the nSTROBEA/nSTROBEB, data is latched into printer port.
Peripheral/printer auto feed (open-drain, active low). Continuous auto-fed
paper is selected when this pin is set to low.
Initialize the Peripheral/printer (open drain, active low). When set to low, Pe-
ripheral/printer starts it’s initialization routine.
Peripheral/printer select (open-drain, active low). Selects the peripheral/printer
when it is set to low.
Peripheral/printer data ports.
Peripheral/printer data ports.
Rev. 1.1
Page 5
5 Page 
NetMos
Technology
Nm9715
PCI Dual 1284 Printer Ports
Config: -B Register
Configuration B register. This register allows software
to control the selecting of interrupts. A read-write imple-
mentation implies a “software-configurable” device.
Reading this register, returns the configured interrupt,
and interrupt pin state. If a value is not set to 000 (the
jumper-default) then it is assumed that the value in the
register is correct and software will use the default in-
terrupt.
Config-B Bit-7:
Not used, set to “0”.
Config-B Bit-6:
0 = Configured printer interrupt pin is low.
1 = Configured printer interrupt pin is high.
Config-B Bit 7-0:
Interrupt pin select register.
Extended Control Register (ECR)
Mode “000”
SPP/Centronics/Compatible Mode
Forward direction only. The direction bit is forced to “0”
and PD7-PD0 are set to output direction. The Nm9715
is under software controlled. This mode defines the pro-
tocol used by most PC’s to transfer data to a printer. It
is commonly called the “Centronics” mode and is the
method utilized with the standard parallel port. Data is
placed on the PD7-PD0 port’s, the printer status is
checked via DSR register. If no error condition is flagged
and printer is not Busy, software toggles the nSTROBE
pin to latch the PD7-PD0 data into printer. This operat-
ing cycle continues when printer/peripheral issues data
acknowledge signal (pules the nACK and nBUSY pin).
Nibble Mode
The Nibble mode is the most common way to get re-
verse channel data from a printer or peripheral. This
mode is usually combined with the Centronics mode or
a proprietary forward channel mode to create a Bi-di-
rectional channel. In this mode printer status bits are
used as Nibble bits.
This register controls the mode selection operation.
Bits order for Nibble mode.
Bit-7
0
0
0
0
1
1
1
1
Bit-6
0
0
1
1
0
0
1
1
Bit-5
0
1
0
1
0
1
0
1
Operating Mode
SPP
PS/2
PPF (FIFO mode)
ECP
EPP
Not used
FIFO test
Config A/B enable
PINS
nBUSY
PE
SLCT
nFAULT
nBUSY
PE
SLCT
nFAULT
DATA Bits
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
Mode changes.
After hardware reset, PS/2 mode is selected as default
mode. It is required to select mode 000 or 001 between
any other mode configuration.
Mode “001”
PS/2, Byte Mode
The Byte mode protocol is used to transfer bi-directional
data via PD7-PD0 ports without FIFO utilization. The
direction of the port is controlled with DIR bit in DCR
register. PS/2-Byte use SPP protocol for data transfer.
DCR Bit-5:
0 = PD7-PD0 pins are out put mode.
1 = PD7-PD0 pins are input mode.
Rev. 1.1
Page 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet NM9715.PDF ] | |
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