參數(shù)資料
型號(hào)： ISP1130N
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Universal Serial Bus compound hub with integrated keyboard controller
中文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PDIP56
封裝： PLASTIC, SDIP-56
文件頁數(shù)： 27/68頁
文件大?。?/td> 1786K
代理商： ISP1130N
Philips Semiconductors
ISP1130
USB compound hub with keyboard controller
Objective specification
Rev. 01 — 23 March 2000
27 of 68
9397 750 06895
Philips Electronics N.V. 2000. All rights reserved.
9.2.2
Select Endpoint command
Selects an endpoint and initializes an internal pointer to the start of the associated
RAM buffer. Optionally, this command can be followed by a data read, which returns
the status of the endpoint buffer (see
Table 29
).
Code (Hex) —
00 to 0B (endpoint index 0 to 11)
Transaction —
read 1 byte (optional).
[1]
This bit is only defined for control endpoints; it is active only when the InterruptOnNAK feature has been enabled via the Set Mode
command (see
Table 25
).
This bit will be logic 0 for IN buffers (host packets are received via the OUT buffer).
[2]
9.2.3
Read Buffer command
Returns the data buffer contents of the selected endpoint. Following the command, a
maximum of (N
+
2) bytes can be read, N representing the size of the endpoint buffer
(see
Table 3
). After each byte the internal buffer pointer is automatically incremented
by 1. To reset the buffer pointer to the start of the buffer, use the Select Endpoint
command.
Code (Hex) —
F0
Transaction —
read multiple bytes (max. N
+
2, N = buffer size).
Reading a buffer may be interrupted by any other command (except for Select
Endpoint). The data in the buffer are organized as shown in
Table 31
.
Table 29: Endpoint Buffer Status byte: bit allocation
Bit
7
6
5
4
3
2
1
0
Symbol
-
-
-
Sent
NAK
Packet
Overwritten
Setup
Packet
Stall
Status
Full
Empty
Status
0
R
Reset
Access
X
R
X
R
X
R
0
R
0
R
0
R
0
R
Table 30: Endpoint Buffer Status byte: bit description
Bit
Symbol
7 to 5
-
4
SentNAK
[1]
Description
reserved
A logic 1 indicates that the device has sent a NAK. This bit is reset when the
device returns an acknowledge (ACK) after receiving an OUT packet, or when it
gets an ACK after sending an IN packet.
A logic 1 indicates that the previous packet was overwritten by a Setup packet.
This bit is reset by a Select Endpoint/Clear Interrupt command on this endpoint.
A logic 1 indicates that the last successfully received packet had a SETUP token.
This bit is reset by a Select Endpoint/Clear Interrupt command on this endpoint.
A logic 1 indicates that the endpoint is in stalled state.
A logic 1 indicates that the buffer is full, a logic 0 indicates that it is empty.
3
PacketOverwritten
2
SetupPacket
[2]
1
0
StallStatus
FullEmptyStatus
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