FDC37B727-NS Standard Microsystems (SMSC), FDC37B727-NS Datasheet - Page 96

• Manufacturer Part Number: FDC37B727-NS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37B727-NS

• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

nStrobe
PData 7:0
nAck
PeriphAck (Busy)
PError
(nAckReverse)
Select
nAutoFd
(HostAck)
nFault
(nPeriphRequest)
nInit
nSelectIn
NAME
TYPE
I/O
O
O
O
O
I
I
I
I
I
Contains address or data or RLE data.
During write operations nStrobe registers data or address into the slave on
the asserting edge (handshakes with Busy).
Indicates valid data driven by the peripheral when asserted. This signal
handshakes with nAutoFd in reverse.
This signal deasserts to indicate that the peripheral can accept data. This
signal handshakes with nStrobe in the forward direction. In the reverse
direction this signal indicates whether the data lines contain ECP command
information or data. The peripheral uses this signal to flow control in the
forward direction. It is an "interlocked" handshake with nStrobe. PeriphAck
also provides command information in the reverse direction.
Used to acknowledge a change in the direction the transfer (asserted =
forward).
nReverseRequest. It is an "interlocked" handshake with nReverseRequest.
The host relies upon nAckReverse to determine when it is permitted to
drive the data bus.
Indicates printer on line.
Requests a byte of data from the peripheral when asserted, handshaking
with nAck in the reverse direction. In the forward direction this signal
indicates whether the data lines contain ECP address or data. The host
drives this signal to flow control in the reverse direction. It is an "interlocked"
handshake with nAck. HostAck also provides command information in the
forward phase.
Generates an error interrupt when asserted. This signal provides a
mechanism for peer-to-peer communication. This signal is valid only in the
forward direction.
required) to drive this pin low to request a reverse transfer. The request is
merely a "hint" to the host; the host has ultimate control over the transfer
direction. This signal would be typically used to generate an interrupt to the
host CPU.
Sets the transfer direction (asserted = reverse, deasserted = forward). This
pin is driven low to place the channel in the reverse direction. The
peripheral is only allowed to drive the bi-directional data bus while in ECP
Mode and HostAck is low and nSelectIn is high.
Always deasserted in ECP mode.
TABLE 40 - ECP PIN DESCRIPTIONS
The peripheral drives this signal low to acknowledge
During ECP Mode the peripheral is permitted (but not
96
DESCRIPTION