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2.3 I/O Buffer Types
This section lists the types of some particular I/Os used in the HDMP-3001 chip.
Table 8. Buffer types
Buffer Type I/O Name Comment
O/D APS_INTB Need external P/U
Output
TS P_RXD_M_TXD[0] Controlled by the “Isolate MII” register bit
Output P_RXD_M_TXD[1]
P_RXD_M_TXD[2]
P_RXD_M_TXD[3]
P_RX_DV_M_TX_EN
P_RX_ER_M_TX_ER
INT See INT Pin Configuration Section
RDYB Uses a T/S output buffer and logically drives high before output buffer is
released or tristated
Input TMS, TRSTB, TDI
w/
Internal P/U
P_TX_CLK_M_RX_CLK
P_RX_CLK_M_TX_CLK
SDA P/U can be disabled if there is an external P/U
SCL
GPIO [15:0]
Note:
All of the internal P/Us are normally enabled, and they can be disabled through the JTAG port, with the exception of SCL and SDA.
The pullups on these two pins can be disabled using controls from register 0x003 bits [5:4].
Bidirectional
w/
Internal P/U
for input
mode